small potato 小人物
smoke like a chimney 烟鬼
smoke O.P.B 吸别人的烟
snake in the grass 隐藏的危险
snap out of it 突然改变情绪;振作起来
Snowed. (学生)被一个问题弄糊涂。
so that's it 原来如此
So what? 那又怎么样?
soft-soap 谄媚
somehow or other 莫名其妙地
sore spot 伤心事，旧疮疤
Sorry to have kept you waiting. 抱歉，让您久等了。
sounds just like 看样子就象
speak of the devil 说曹操曹操到
speak the same language 志同道合