sign/ saɪn /

1.noun [c] 
(notice) 指示牌

a sign saying "No Exit"
一块写着“禁止入内”的指示牌
2.noun [c] 
(also: road sign) 路标

3.noun [c] 
(gesture) (with hand etc) 手势

the V-for-victory sign
代表胜利的V字手势
4.noun [数] [ 音] 
(symbol) 符号

an equals sign
一个等于号
5.noun [c/u] 
(indication,evidence) 迹象

The sky is clear and there's no sign of rain.
天空晴朗,丝毫没有要下雨的迹象。
6.noun [c] [Astrology] 
星座

7.vt.[+document] 
签署

8.vt.[+TV programme] 
(for deaf people) 用手语演播

9.vt.[Soccer] [+player] 
与…签约

10.vi.
(use sign language) 使用手语

11.vi.[Soccer] [player+] 
签约

to make a sign
做手势
a plus/minus sign
正/负号
there's no sign of her changing her mind
她没有任何要改变主意的表示
he was showing signs of improvement
他的身体有好转的迹象
a sign of the times
时代的特征
it's a good/bad sign
这是个好/坏兆头
to sign one's name
签名