bad-mouth: say unkind, unflattering, embarrassing (and probably untrue) things about someone.
A: "I don't believe what Bob said. Why is he bad-mouthing me?"
B: "He's probably jealous of your success."

be a piece of cake: be very easy.
A: "Bob said the test was difficult, but I thought it was a piece of cake.""

be all ears: be eager to hear what someone has to say.
A: "I just got an e-mail message from our old friend Sally."
B: "Tell me what she said. I'm all ears!"

be broke: be without money.
"No, I can't lend you ten dollars. I'm completely broke until payday."

be fed up with (with someone or something): be out of patience (with someone or something);
be very tired of someone or something.
"Bill, you're too careless with your work. I'm fed up with
apologizing for your mistakes!"

be in and out: be at and away from a place during a particular time.
"Could we postpone our meeting until tomorrow? I expect to
be in and out of the office most of the day today."

be on the go: be very busy (going from one thing or project to another).
"I'm really tired. I've been on the go all week long."

be on the road: be traveling.
"You won't be able to contact me tomorrow because I'll be on the road."

be over: be finished; end.
"I can't see you until around 4 o'clock. My meetings won't be over until then."

be up and running: (for a technological process) be operational; be ready to use .
"Dave's ESL Cafe on the Web has been up and running since December 1995."

be used to (+Ving/noun): be accustomed to; not uncomfortable with.
"It won't be hard to get up at 5:00 AM. I'm used to getting up early."

beat: exhausted; very tired (adj.).
"This has been a long day. I'm beat!"

beat around the bush: evade an issue; avoid giving a direct answer.
"Quit beating around the bush! If you don't want to go with me, just tell me!"

beat one's brains out: try very hard to understand or do something.
"Can you help me with this problem? I've been beating my brains out with it,
but I just can't solve it."

Beats me: I have no idea.
A: "What time's the party?"
B: "Beats me!"

before long: soon.
A: "I'm really tired of working."
B: "Just be patient. The weekend will be here before long."

bent out of shape: needlessly worried about something.
"I know you're worried about your job interview, but don't get bent out of shape.
You'll do just fine."

bite off more than one can chew: take responsibility for more than one can manage.
"I'm really behind with my project. Can you help me? I'm afraid I
bit off more than I could chew!"

blabbermouth: a very talkative person--especially one who says things that should be kept secret.
"Don't say anything to Bob unless you want the whole office to know.
Bob's quite a blabbermouth."

blow one's top: become extremely angry.
A: "Was your father upset when you came home at 3 AM?"
B: "He was more than upset. He blew his top!"

boom box: portable cassette/CD player.
"Don't forget to bring your boom box to the picnic!"

the bottom line: the most essential information.
"The discussion lasted many hours. The bottom line was that
the XYZ Company isn't for sale."

Break a leg!: Good luck!
"I understand you have a job interview tomorrow. Break a leg!"

break someone's heart: make someone feel very disappointed/discouraged/sad.
"Joe broke his mother's heart when he dropped out of school."

broke: without money.
A: "Can you lend me 10 dollars?"
B: "I'm afraid not. I'm broke."

buck(s): dollar(s).
"The cheapest tickets for the concert cost 25 bucks. Do you still want to go?"

bug: annoy; bother.
"I'm trying to concentrate! Don't bug me!"

bull-headed: stubborn; inflexible.
"Don't be so bull-headed. Why can't you admit that others' opinions are just as good as yours?"

a bundle: a lot of money.
A: "Your new car is really nice."
B: "It should be. It cost me a bundle!"

burn the midnight oil: study/work all night or until very, very late at night.
"I'm not ready for the test tomorrow. I guess I'll have to
burn the the midnight oil."

bushed: very tired; exhausted.
"I'm going to lie down for a while. I'm really bushed."

by oneself: alone and without help.
"I can't do this by myself. Can you help me?"

by the skin of one's teeth: barely succeed in doing something.
"I'll have to start earlier the next time. This time I only finished by the skin of my teeth."

call it a day: stop work for the day.
"It's late and you've accomplished a lot. Why don't you call it a day?"

can't make heads or tails of something: can't understand something at all;
find something confusing and illogical.
"I can't make heads or tails of your e-mail. Were you having problems
with your computer?"

catch one's eye: attract one's attention/interest.
"This brochure about Tahiti caught my eye when I was at the travel agency."

catch some Zs: sleep for a while; take a nap.
"You look tired, Dave. Why don't you catch some Zs?"

change one's mind: decide to do something different from what had been decided earlier.
A: "Why are you working this week? I thought you were going to be on vacation."
B: "I changed my mind. I'm taking my vacation next month."

chicken (adjective or noun): cowardly.
"Fred will never ask Lucy for a date. He's chicken / a chicken.

chow: food.
"How's the chow in the university cafeteria?"

chow down: eat.
"It's almost 6:00. Are you ready to chow down?"

a cinch: something that's very easy to do.
A: How was the test?
B: It was a cinch. I finished it quickly and I know that all my answers were correct."

cool (also kewl): neat, special, wonderful.
"The ESL Cafe on the Web is really cool!"

Cool it!: calm down.
"There's no need to be so upset. Just cool it!"

cost (someone) an arm and a leg: cost a lot; be very expensive.
A: "Your new car is really nice."
B: "It should be. It cost (me) an arm and a leg!"

couch potato: someone who spends too much time watching TV.
"You're a real couch potato, Jay. You need to get more exercise!"

cram: try to learn as much as possible in a very short time.
"Sidney did well on the test because he crammed for it. However, he probably
won't remember any of the information a couple of days from now."

crash course: short course designed to give a lot of knowledge/information in a very short time.
"Tom's company is sending him to a business meeting in Istanbul.
Should he take a crash course in Turkish?"

Cut it out!: stop doing something (that's annoying).
"You kids are making too much noise. Cut it out!"

Don't count your chickens until (before) they hatch (they've hatched).: Don't assume
that something will happen until it has happened.
A: I'm sure that I'm going to win a lot of money in Las Vegas."
B: "Don't count your chickens until they hatch!"

dicey: uncertain; taking too much of a chance.
A: A friend of mine says I can make a lot of moneyif I buy stock
in the XYZ company. Should I do it?
B: I wouldn't if I were you. The chances for success are too dicey."

ditch class: skip class/play hookey.
"You shouldn't have ditched class yesterday. We had an unannounced test."

do a bang-up job: do a very good job; do very well at something.
"Have you seen Frank's home page? He did a bang-up job with it."

down in the dumps: depressed; "blue."
A: "Is something wrong?"
B: "Not really, but I feel kind of down in the dumps."

drop someone a line: write to someone.
"I haven't written to my parents for a long time. I'd better drop them a line
today or tomorrow."

drag one's feet: delay; take longer than necessary to do something.
"Joe should have finished his project a week ago. Why is he dragging his feet?"

an eager beaver: a person who is always willing to volunteer or do extra work.
"Jan is certainly an eager beaver. Any time there's work to be done,
she's the first to say she'll help."

Easy does it!: Be very careful! / Don't do anything too fast or too hard!
A: "I'm going to move the table just a little further from the window."
B: "Easy does it! If you move too fast, you might knock over the plant!"

an egghead: a very intelligent person.
"Jake didn't make very good grades in school, but his sister was a real egghead."

elbow grease: hard work; effort.
"Yes, the car is pretty dirty, but it'll look nice again with a little elbow grease."

every other _____ : alternately; omitting the second one in each group of two.
"In your essays, please write on every other line. That will make the
essays much easier to read