1.In the nick of time: 紧要关头。
You gave me that main idea help in the nick of time – my teacher just gave us a quiz on that reading skill and I passed it!
2.Let the cat out of the bag: 说出秘密。
Brady's surprise party is going to be great if you don't let the cat out of the bag.
3.Let the chips fall where they may: 让某事发生，不管其是好是坏。
I'm going to just try out for the cheerleading squad and let the chips fall where they may.
4.Lose your marbles:变得疯狂。
Mom has really lost her marbles; she's making me practice writing the Enhanced ACT Essay seven times this week!
5.Once in a blue moon: 罕见的。
In Florida, the temperature drops below freezing only once in a blue moon.
6.Plain as day: 显而易见的。
It's plain as day that you're in love with her, so just admit it.
7.Play second fiddle: 居次位。
I hate playing second fiddle to my sister; she always does things better than I do!
8.Put your foot in your mouth: 说错话。
Jessica really put her foot in her mouth when she asked about John’s job right after he lost it.
9.Pull yourself together: 冷静下来；振作起来。
Pull yourself together, man! Sure, your girlfriend just dumped you and then you got hit by a car, but you can't let those things get you down.
10.Sick and tired: 被打扰或困扰。
She is sick and tired of her dog chewing up her shoes every day.
11.Sleep on it: 在做决定前先考虑一会。
Don't tell me whether you'll move to Texas with me or not today. Sleep on it, and get back to me tomorrow.
12.Snug as a bug in a rug:温暖舒适的；满足的。
That baby looks as snug as a bug in a rug cuddled up next to his mother.
13. Step up your game: 迎头赶上。
Listen, Jen. You'd better step up your game if you want to get all A's in Miss Finch's Physics class. She isn't easy!
14.Stick your nose into something: 干涉。
Sharon always sticks her nose into everyone else’s business.
15.Straight from the horse's mouth: 来自最可靠的消息。
Listen to the news straight from the horse's mouth; we're all getting bonuses this week!
16.Take it easy: 放松。
I know you're not feeling well, so try to take it easy today.
17.Tip of the iceberg: 一个较大问题的显而易见的一小部分；冰山一角。
The fact that Carrie is dating a member of the mafia is just the tip of the iceberg; she's also smuggling contraband into the country.
18.To not see the wood for the trees: 一叶障目；只看到细节而未注意到最重要的事实。
She always argues about the silliest things; it’s like she can’t see the wood for the trees.
19.Up a creek without a paddle:处于困境之中。
If you don't have any money to pay for the repairs we just made to your car, I guess you're up a creek without a paddle because you can’t have your car back.
20.You rock!: 你真棒！
Dude. You rock. Thanks for offering to watch my pet iguana all week.