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N-COUNT
(以手势、声音、行动等发出的)信号，暗号
A signal is a gesture, sound, or action which is intended to give a particular message to the person who sees or hears it.
例句
They fired three distress signals...
他们发射了3次求救信号。
As soon as it was dark, Mrs Evans gave the signal...
天一黑，埃文斯夫人就发出了信号。
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VERB
(用手势、声音等)发信号，发暗号，示意
If you signal to someone, you make a gesture or sound in order to send them a particular message.
例句
The United manager was to be seen frantically signalling to McClair...
一会儿可以看到曼联主教练拼命地朝麦克莱尔示意。
He stood up, signalling to the officer that he had finished with his client...
他站起身，向警察示意他和他的当事人已经谈完了。
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迹象;信号;预示
If an event or action is a signal of something, it suggests that this thing exists or is going to happen.
例句
Kurdish leaders saw the visit as an important signal of support...
库尔德领导人将这次访问视作一种表示支持的重要信号。
The first warning signals came in March...
第一次警示出现在3月份。
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VERB
预示;表明;显示
If someone or something signals an event, they suggest that the event is happening or likely to happen.
例句
She will be signalling massive changes in energy policy...
她将暗示能源政策会有重大变化。
Britain was signalling its readiness to have the embargo lifted...
英国表示愿意取消贸易禁令。
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(铁路上的)指示灯，信号灯
A signal is a piece of equipment beside a railway, which indicates to train drivers whether they should stop the train or not.
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(传输信息的无线电、光波或电流)信号
A signal is a series of radio waves, light waves, or changes in electrical current which may carry information.
例句
...high-frequency radio signals.
高频无线电信号
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ADJ
重大的;显要的;非凡的
You use signal to describe a success or failure when you are emphasizing the fact that it has occurred and are indicating that the consequences are significant.
例句
His final round was a signal triumph in a career marked by many sweet moments.
最后一场比赛的胜利在他充满欣喜的职业生涯中具有非凡的意义。
...John Major's signal failure to grab America's attention.
约翰·梅杰显然没有能够引起美国的注意