1.those second-hand pianos are selling like hot cakes， if you want one， you'd better buy one now before they're all gone. sell like hot cakes=sell very well or very quickly
2.whenever i have to make a speech i get butterflies in my stomach. get butterflies in one's stomach=get nervous
3 he would do anything for his daughter. she was the apple of his eye. be the apple of one's eye=be very precious to sb.
4 lend me ，please， tom， i'm broke at the moment. be broke=doesn't have any money
5 the accident was caused by a taxi driver jumping the green light. jump the green light=doesn't wait for the traffic lights to change to green。
6.you didn't think i was serious， did you， joe! it was a joke! i was pulling your leg， that's all. pull one's leg=tease someone，逗某人玩
7 because the owner wanted a quick sale， the painting went for a song-only. if something "goes for a song"， it is sold very cheaply
8 there was a shortage of food; so you had to pay through the nose for what you could find. to "pay through the nose " for something is to pay far more for something than it is really worth
9 if he finds out what you did with the company's money， he'll hit the roof. hit the roof=get very angry
10 the sky got very dark and soon the rain began to bucket down. bucket down = rain very heavily
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