"to speak of the devil" A) to have an uncomfortable conversation / B) the person who you were talking about unexpectedly arrives / C) to talk about a person you don't like
B) the person who you were talking about unexpectedly arrives（說曹操曹操就到）
"to skate on thin ice" A) to be in a risky situation / B) to do something challenging / C) to not like something you have to do
A) to be in a risky situation（如履薄冰）
"a piece of cake" to describe something A) very sweet / B) very fun / C) very easy
C) very easy（簡單啦！）
"to ring a bell" A) something sounds familiar / B) to get attention / C) something that makes a lot of noise
A) something sounds familiar（我記起來了！/not ring a bell means （抱歉沒印象））
"to cost an arm and a leg" A) something cheap / B) something expensive / C) something of low quality
B) something expensive（重大的代價）
"to bite the bullet" A) to do something that makes you nervous / B) to do something that makes someone else uncomfortable / C) to make yourself do something difficult or unpleasant
C) to make yourself do something difficult or unpleasant（咬緊牙關、to swim upstream =逆流而上.Both of it has negetive meaning）
"to get cold feet" A) suddenly change your emotion eg: happy to sad / B) to suddenly change your mind about something because you are nervous / C) to be anxious about something.
B) to suddenly change your mind about something because you are nervous（臨陣脫逃）
"as clear as mud" A) something brown / B) something confusing / C) something obvious
B) something confusing（像淤泥一樣、不清不楚（clear和mud是相反的東西、irony（反諷）的意味））
"to be on the ball" A) to be alert / B) to be on the top / C) to be funny
A) to be alert（很在狀態）
"to put your feet up" A) to be tired / B) to relax / C) to be clumsy
B) to relax（像動物一樣，四脚朝天、放鬆）
"break a leg!"
A) well done! /
B) have fun! /
C) good luck!
C) good luck!（祝你好運）
"to take the plunge" A) to commit to a decision (often one that makes you nervous) / B) to fall（從很高的地方掉下來） (from a very high place) / C) to make a choice (especially between two similar options)
A) to commit to a decision (often one that makes you nervous)（下定決心）
"once in a blue moon" A) usually / B) never / C) rarely
C) rarely（很罕見）
"to give the green light" A) to allow something / B) to prohibit something / C) to like something
A) to allow something（給綠燈、歐虧）
"to be left out in the cold" A) to be alone / B) to be excluded / C) to be freezing
B) to be excluded（被冷落了。）
"to pull someone's leg" A) to make someone uncomfortable or anxious / B) to fool or joke someone / C) to make someone happy about something
B) to fool/joke someone(開別人玩笑（善意的）)
