side-kick 莫逆之交
sign up for 报名参加
sink in the scale 降低
sitting pretty 过着舒服的生活
sixes and sevens 乱七八糟
sixth sense 第六感
size up 打量
sleep in this morning 睡个懒觉
slip one's memory 一时忘记
slow-poke 行动迟缓的人
slowly but surely 稳扎稳打
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