sit with . be accepted by被接受（常用于否定句或疑问句中）

Did your story sit with your mother? 你编造的假话你母亲相信吗?

Bob's poor sportsmanship does not sit well with the coach．鲍勃不守运动道德，教练对此很恼火。

sit with . nurse or attend somebody  who is ill照看病人

You go to bed for an hour；I'll sit with your mother while you are asleep．你去睡一小时，我来帮你照看你母亲。

 size up . decide what one thinks about or form an opinion about考虑或估量

Give Joe an hour to size up the situation and he'll tell you what to do next．给乔一个小时分析一下形势，然后他会告诉你下一步该怎么办。

As the outlook sizes up at this time，we are going to have another good harvest this year．照目前的情况看来，我们今年又将获得丰收。

skate on thin ice . take a chance； risk danger如履薄冰；冒险

A politician would be skating on thin ice if he took a stand in opposition to a popular cause．一个政治家如果反对群众欢迎的事，那将是十分危险的。

If I were you，I wouldn't do it that way．As it is，I think you're skating on thin ice．要是我，我决不会那样干。就眼下情况看，我认为你是在冒险。

 skeleton in the closet . A shameful secret in a family家丑

The skeleton in our family closet was Uncle Willie．No one mentioned him because he drank too much．我们家见不得人的是威利叔叔，他喝酒太多，因此没有人提起他。

 sketch out . draw roughly，草拟；概略地叙述

He sketched out his plan， so that we had some idea of what he would do．他概略地叙述了他的计划，使我们对他的打算有所了解。

He sketched out the general picture first．他先把整幅画粗略地画了出来。

skim through . read quickly through浏览

I have just skimmed through the book；I intend to read it thoroughly when I get more time．这本书我只是浏览了一下，打算以后有充裕的时间再精读它。

skip off . skip out . leave without attracting attention 悄悄离开

He skipped off quickly when the waiter brought us the bill．侍者拿来帐单时，他很快溜走了。

She is always skipping out when there is washing up to be done．当要洗碗时，她总是悄悄溜走。

skip over . pass over； omit；ignore略过；遗漏；忽视

Let's skip over these points and come to the main argument．我们略过这几点来看看主要论点吧。

I'll skip over your rudeness．我不会计较你的粗鲁。

slap down .  slam down砰地摔下

A boy in uniform came into the shop， slapped a telegram down on the counter，and went out without waiting for a reply．一个穿制服的小伙子走进店铺，把一封电报啪地一声放在柜台上，不等答话就走了。

slap down . firmly prevent somebody from doing something 坚决阻止；斥责

He soon slapped her down when she wanted to speak．她想说话时，他很快阻止了她。

Anyone who speaks out of turn in the Old Man's presence is liable to be slapped down．谁要是在老板面前随随便便说话都会遭到严厉训斥。

Any attempt at reform was quickly slapped down．进行改革的任何企图都很快地遭到压制。

slap down . reduce in stature or humiliate，as if by slapping灭…的威风；羞辱

It is time someone slapped him down．该是杀杀他威风的时候了。

slap in the face . an insult；a disappointment侮辱；失望

The minister's decision was a slap in the face to those who had tried to change his mind．部长的决定等于是在那些企图使他改变主意的人的脸上打了一记耳光。

Susan thought it was a slap in the face when her boyfriend invited another girl to the dance．苏珊认为她男友邀另一女孩去跳舞对她是一种侮辱。

slap in the face . insult；embarrass；make feel bad侮辱某人；使某人不快

I don't want to slap her in the face by not coming to her party．我不想由于不参加她的晚会而使她扫兴。

sleep off . get rid of by sleeping以睡眠消除；以睡眠治愈

She is suffering from headache and I tell her to sleep it off．她头痛，我告诉她睡一睡就会好的。

He is in a bad mood today，but he'll sleep it off．他今天情绪不好，不过睡一觉就会好的。

sleep on . have a night's sleep before making a decision about something 把某事留待第2天解决

I can't decide what to do． I'll sleep on it and let you know tomorrow．我现在定不下来该怎么做，今天晚上好好想想，明天告诉你。

Let's sleep on it and try again tomorrow．我们把问题留待明天再设法解决吧。

 slide over . pass over quickly； barely touch upon略过；稍为触及

This is not a matter that can be slid over；let's discuss it openly．这不是一个可以随便滑过去的问题，还是让我们坦率地加以讨论吧。

You may slide over the problem now， but I'm quite sure it will crop up again one day．眼下你可以回避这个问题，不过，我相信这问题有一天还会出现的。

 slip away . leave quietly悄悄离开

I'd like to slip away before the end of the meeting，so I'll sit at the back．我想在会议结束前溜走，因此我要坐在后排。

 slip away . （of time） pass quickly（时间）过得很快

The summer has simply slipped away，but we've had such fun！夏天就这么过去了，可我们玩得真痛快！

 slip by . pass away quietly（时间）悄悄过去

As the years slipped by，I thought less about her．随着岁月的流逝，我越来越不想她了。

The afternoon slipped by very pleasantly．一个下午很愉快地就过去了。