1.hot potato 烫手山芋(喻指繁杂的难题)
They will do anything they can to drop her like a hot potato.
2.in hot water 碰到不便
I needed to be at the airport early, and as I got into a taxi I was worried that I might be in hot water if traffic congestion was worse than normal.
3.hot and bothered 焦躁不安
Officials at the Defence Ministry are getting all hot and bothered about secrets getting out.
4.full of hot air 高谈阔论
His utterances were full of hot air.
5.blow hot and cold 变化无常，犹豫不定
Some people can make up their minds right away, but others blow hot and cold.
6.have the hots for 痴迷别人
George seems to have the hots for Mary.
7.hot on the heels 略逊一筹
Hot on the heels of Baidu’s new mobile OS launch, reports are circulating that the Chinese search giant is partnering with Dell to build tablets and mobile phones.
8.in the hot seat 唱主角;困境，难堪处境
He is to remain in the hot seat as chief executive.
The CEO found himself in the hot seat after another bad quarter.