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n (1)信(暗)號(sign (eg a movement of the hand，a light，a sound)，esp one arranged beforehand，giving a command，warning or other messages)[C]：smoke～s 煙霧信號;a danger～危險(xiǎn)信號;A red light/lamp/flag is often used as a～for (of) danger. 紅燈/燈/旗常被用作危險(xiǎn)的信號。 give the～to attack/advance 發(fā)出進(jìn)攻/前進(jìn)的信號;make a～with a red light 用紅燈發(fā)出信號;raise one's hand as a～for the game to begin 舉手示意比賽開始;〖同〗sign，indication;

(2)信號機(jī)(器，物)(machine，device or object，etc used for this purpose)[C]：a railway～鐵路信號燈;traffic～s 交通信號燈;a～device 信號機(jī);

(3)觸發(fā)……的行動和事件(action or events that causes sth else to happen)[C][N (for)]：Her arrival was the～for the party to begin. 她的到達(dá)意味著宴會即將開始。 The strike was the～for revolt. 罷工是叛亂的導(dǎo)火線。

(4)(無線電等)信號(message，sound received or sent by a radio set，etc)[C]：pick up a radio～from the missing boat 捕捉到失蹤船只的無線電信號;receive a～from a satellite 接收到衛(wèi)星訊號;an area with a(n) poor/excellent TV～電視信號不良/極佳的地區(qū);

v(1)發(fā)(打)信號(make a signal or signals)[I，I+prep (to) (for)]：Joan was～ling wildly. 瓊在使勁地打著信號。 He was～ling urgently to me. 他在急切地向我打手勢。 The ship～led for a pilot. 那條船發(fā)信號要求派引水員去。He～led to his soldiers for the attack to begin. 他向士兵們發(fā)出開始進(jìn)攻的信號。

(2)用信號示意(警告)(make known of warn with or as if with signals)[T+n，T+n+prep (to)，T+that，T+wh-inf，D+n+prep (for/to)，D+n+that，D+to+n+that，D+n+wh，D+to+n+wh，C+n+to-inf，D+prep (to)+to-inf]： The bugler～led a retreat. 號兵吹號通知撤退。The sergeant～led an order.中士打手勢發(fā)出命令。Both sides have～led their willingness to start negotiations. (fig)雙方都表示出開始談判的意愿。～a message to sb 向某人發(fā)消息;～(to sb) that one is about to turn left(向某人)發(fā)信號示意要左轉(zhuǎn)彎;～(sb) which way Mary is going to 用信號告知(某人)瑪麗要走哪條路;We～led a passing ship for help. 我們向一艘駛過的船發(fā)出了求救信號。The thief～led (his friend) that a policeman was coming. 那小偷(向他的同伙)示意警察來了。 The conductor～led the orchestra to rise.指揮示意樂隊(duì)起立。The office～led his men to advance. 軍官示意士兵們前進(jìn)?！纪絤otion，gesture;

(3)標(biāo)志著，表明(be a sign of)[T+n]：A period～s the end of a sentence. 句號表示一個句子的結(jié)束。

→′signaler n 信號員(兵);′signalman n 信號員(兵);′signal-box n 信號所(塔)