signal

signal1
noun
  1. a gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned
    信号；暗号
    the firing of the gun was the signal for a chain of beacons to be lit.
    开枪是接连点燃烽火的信号。
    [with infinitive]the policeman raised his hand as a signal to stop.
    警察举起手，示意停下。
    ■an indication of a situation
    指示；表示
    the markets are waiting for a clear signal about the direction of policy.
    市场正等待着一个明确的政策动向。
    ■an event or statement that provides the impulse or occasion for something specified to happen
    起因；导火线
    the champion's announcement that he was retiring was the signal for scores of journalists to gather at his last match.
    这位冠军宣布他将退役，这就是那么多记者出席他最后一场比赛的起因。
    ■an apparatus on a railway, typically a coloured light or a semaphore, giving indications to train drivers of whether or not the line is clear
    （铁路上的）信号灯
    ■(Bridge)a pre-arranged convention of bidding or play intended to convey information to one's partner
    (桥牌)信号
  2. an electrical impulse or radio wave transmitted or received
    （电脉冲或无线电波传递或接收的）信号
    equipment for receiving TV signals.
    接收电视信号的设备。
(signalled, signalling; 美 signaled, signaling)
  1. [no obj.]transmit information or instructions by means of a gesture, action, or sound
    用信号传递信息（或指示）；发信号
    hold your fire until I signal.
    在我发信号之前，一直举着火把。
    ■[with obj. and infinitive]instruct (someone) to do something by means of gestures or signs rather than explicit orders
    （用信号）示意
    she signalled Charlotte to be silent.
    她示意夏洛特不要说话。
    ■(of a cyclist, motorist, or vehicle) indicate an intention to turn in a specified direction using an extended arm or flashing indicator
    （骑自行车者，驾驶司机，交通工具）打信号（以示转向）
    [with complement]Stone signalled right.
    斯通打出右转的信号。
    [with infinitive]the truck signalled to turn left.
    卡车打出左转的信号。
    ■[with obj.]indicate the existence or occurrence of (something) by actions or sounds
    （用举动或声音）表示，表明
    the Community could signal displeasure by refusing to cooperate.
    该社区可以通过拒绝合作来表明自己的不悦。
    ■[with clause]give an indication of a state of affairs
    指示，表明
    she gave a glance which signalled that her father was being secretive.
    她瞥了一眼，暗示她父亲不坦率。
派生
signaller
noun
语源
  1. late Middle English: from Old French, from medieval Latin signale, neuter of late Latin signalis, from Latin signum 'mark, token' (see sign). The verb dates from the early 19th cent
signal2
adjective
  1. [attrib.]striking in extent, seriousness, or importance; outstanding
    明显的；显著的；显要的；出色的
    he attacked the government for their signal failure of leadership.
    他攻击政府明显无能领导。
派生
signally
adverb
语源
  1. early 17th cent.: from French signalé, from the Italian past participle segnalato 'distinguished, made illustrious', from segnale 'a signal'
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