★ sign
① [C]符号
a plus sign 加号
② n. 指示牌;标记
a road/ traffic sign:道路/交通标识
The sign says＂ No smoking”告示牌上写着“禁止吸烟”。
③ [(头、手、眼等的)示意动作;手势
He made a thumb- up Sign.他竖起大搏指。
sign language手语
④ n.迹象;征兆( indication)
The rainy weather showed no sign of improving.
雨还在下，没有转晴的迹象。
⑤ v. 签(名;签字(于信、文件等)
Sign an agreement/ a contact签协议/合同
⑥ v. 示意;以手势表示( signal)
The teacher signed me to enter.老师打手势示意我进来。
▲sign up(for)报名参加(课程等);登记注册:
sign up for the course in advance
提前报名参加课程
I＇m ready to sign up for the mid July group.
我准备报名参加7月中的那个团。
★派生词：signal
①n. 信号;信号灯:
This was a signal for him to continue.这是一个让他继续的信号。
②v. 发信号;示意;表明;标志着
The bell signalled that school was over:铃声响起放学了。
★派生词：signature n.署名;签名:
add/ write one’s signature签字
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