· in a jiffy不大一會兒
=in a moment, right away. at once
I'll be with you in a jiffy.
· have ( a case of ) the jitters忐忑不安
The new teacher had a case of jitters when he first stood in front of the class.
· keep up with the Joneses與別人比闊，與別人攀比
He likes keeping up with the Joneses.
· get a kick out of doing something從……的樂趣
He gets a kick put of racing.
· take kindly to something/someone愿意
Don't you feel that people in the lab don't take kindly to a nosy reporter?
· kill someone with kindness好得讓人受不了
The old lady almost killed me with kindness when I lived at her home.
· parade one's knowledge買弄學問
He is a well-learned man, bit he never parades his knowledge.
· be at large逍遙法外（也可以形容動物不受約束）
The murderer was still at large. The victim's parents was determined to find enough evidence to sue him to court.
· rest on one's laurels故步自封，吃老本
You are sure to be lagged behind if you rest on your laurels.
· turn over a new leaf洗心革面
The juvenile delinquent promised that he would turn over a new leaf if he could be given lenient punishment.
· have a hollow leg（喝酒）海量
The best man has a hollow leg. He drinks a lot instead of the bridegroom.
· pull someone's leg開某人的玩笑
Never ever pull his leg. He is a man without a sense of humor. He takes everything seriously.
· keep someone at arm's length與某人距離
My boss is my uncle. In order to avoid unnecessary misunderstanding, I'd better keep him at arm's length in company.
· let someone down使某人失望
Joe really let me down by having broken his promises for several times.
· can't for the life of one怎么……也不行
I thought I could recite my speech backwards, but when I stood in front of the audience, I couldn't for the life of me remember what to say.
· air one's linen in public家丑外揚
The wife was often beaten by her husband, but she never told others. She didn't want to air her linen in public.