＇Give him a big hand＇是“给他一个大嘴巴子”？！
A hand
例句：
o you need a hand with those invoices?
要不要我帮你处理那些发票？
I'll need a hand to negotiate these steps.
我将需要一位有经验的人来成功越过这几步。
例句：
Let me give you a hand with those bags.
我来帮你拎那些包吧。
Life doesn 't always give us a hand and doing our best doesn' t always bring good results.
生活并不总会帮助我们，尽力也并不一定会有好的结果。
a big hand
例句：
Let's give the young singer a big hand.
让我们为这位年轻的歌手鼓掌。
Here is professor Li, let's give him a big hand.
李教授来了，让我们热烈鼓掌欢迎李教授。
green hand
例句：
He is a green hand in business management.
在业务管理方面，他是个新手。
They are always too busy to help a green hand like me.
他们总是太忙了，不能帮一下我这个新手。
free hand
free hand
但实际上，这个词可以指：有绝对的自由处理，决定某事。
例句：
He gave Stephanie a free hand in the decoration.
他放手让斯蒂芬妮全权负责装修一事。
I have resigned, and they have a free hand to appoint whom they like in my place.
我已经辞职了，他们可以放开手脚任命他们喜欢的人来顶替我的位置。
hot hand
'hot hand' 字面上可以理解为“手很热”，但在一些赌博竞技的语境时，可以形容一种持续性的好运气，在一些竞技比赛的时候也可以这样表达。
例句：
Funds performance persistence is no obvious, 'hot hand' phenomenon does not exist in China.
我国基金业绩的没有明显的业绩持续性，好手（Hot Hand）现象并不存在。
I'm not good at poker, but I had a hot hand last night.
我不擅长扑克，但我昨晚运气特别好。
cool hand
例句：
I didn't know that the fellow was a cool hand.
我不知道那家伙是个厚颜无耻的人。
I've never seen such a cool hand.
我从未见过脸皮这么厚的人。
dab hand
'dab hand'的英文释义是：
someone who is very good at a particular activity
即“能手；高手”。
这个短语源于18世纪前的约克郡方言，到了20世纪50年代才在英国广泛使用。
2011年《纽约时报》的某篇文章中，引用了语言学家Geoffrey Nunberg的一句话，他在这句话中便使用了这个短语：
I fancy myself a dab hand at Google, but it drives me crazy.
例句：
When it comes to carpentry, he is quite a dab hand.
要说木匠活儿呀，他可是（个）内行。
She's really good at farm work.; She's a dab hand at farm work.
她农活干得好着呢。
sit on hands
例句：
Negotiate about Afghanistan, but don't sit on your hands while you bargain.
谈判阿富汗问题吧，但当你谈判时不要坐守不前、不采取行动。
Officials sit on their hands as taxes keep increasing.
税务持续上涨的时候，官员们不闻不问。
hand in glove
例句：
He was found to be hand in glove with the enemy.
已发现他跟敌人勾结在一起。
The traitor and the enemies were working hand in glove with each other.
这个叛国者现在和敌人勾结在一起。