- A signal is a gesture or message that people use to communicate with each other. The wave you give a good friend to call her over from across the room and the impulse that transmits your voice through the telephone to your mother are both signals.
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- n. 信号；
- v. 发信号,示意；表达
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1. a danger signal, a warning signal,
危险、警告的信号
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2. At an agreed signal they left the room.
收到约定的信号后，他们离开了房间。
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3. When I give the signal,run!
我一发信号，你就跑！
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4. All I get is a busy signalwhen I dial his number (= his phone is being used).
我什么时候拨他的电话听到的都是忙音。
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5. hand signals
示意手势
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6. traffic signals
交通信号灯
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7. a stop signal
停车信号
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8. a radar signal
雷达信号
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9. to detect/pick up signals
探测╱收到信号
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10. I couldn't get a signalon my cell phone.
我的手机接收不到信号了。
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11. Don't fire until I signal.
等我发出信号后再开枪。
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12. He signalled to the waiter for the bill.
他示意服务员结账。
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13. She signalled him to follow.
她示意他跟她走。
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14. He signalled his discontent by refusing to vote.
他拒绝投票以示不满。
- signal (adj.) "remarkable, striking, notable" ("serving as a sign"), 1640s, from French signalé, past participle of signaler "to distinguish, signal" (see signal (n.)).
- signal (n.) late 14c., "visible sign, indication," from Old French signal, seignal "seal, imprint, sign, mark," from Medieval Latin signale "a signal," from Late Latin signalis (adj.) "used as a signal, pertaining to a sign," from Latin signum "identifying mark, sign" (see sign (n.)). Restricted sense "agreed-upon sign (to commence or desist, etc.) is from 1590s. Meaning "modulation of an electric current" is from 1855.
- signal (v.) 1805, "to make signals to," from signal (n.). Related: Signaled; signaling. Earlier verb was signalize (1650s).
sig·nal ★ / ˈsɪɡnəl ; NAmE ˈsɪɡnəl / noun , verb , adjective signal signals signalled signaled signalling signaling noun ★ 1 ★ a movement or sound that you make to give sb information, instructions, a warning, etc. 信号；暗号 SYN sign ◆ a danger/warning/distress, etc. signal 危险、警告、遇难等信号 ◆ At an agreed signal they left the room. 收到约定的信号后，他们离开了房间。 ◆ The siren was a signal for everyone to leave the building. 警报器一响，就是要所有人离开大楼。 ◆ When I give the signal,run! 我一发信号，你就跑！ ◆ ( NAmE) All I get is a busy signalwhen I dial his number (= his phone is being used). 我什么时候拨他的电话听到的都是忙音。 ◆ hand signals (= movements that cyclistsand drivers make with their hands to tell other people that they are going to stop, turn, etc.) 骑车人和驾车人的示意手势 ☞see also turn signal 2 ★ an event, an action, a fact, etc. that shows that sth exists or is likely to happen 标志；预示；信号 SYN indication ◆ The rise in inflation is a clear signalthat the government's policies are not working. 通货膨胀率的上升清楚地表明，政府的政策不起作用。 ◆ Chest pains can be a warning signalof heart problems. 胸部疼痛可能是心脏病的警告信号。 ◆ Reducing prison sentences would send the wrong signalsto criminals. 减刑会向犯罪分子发出错误的信息。 ☞synonyms at sign 3 ★ a piece of equipment that uses different coloured lights to tell drivers to go slower, stop, etc, used especially on railways/railroads and roads （尤指铁路和公路上的）指示灯，信号灯，红绿灯 ◆ traffic signals 交通信号灯 ◆ a stop signal 停车信号 4 ★ a series of electrical waves that carry sounds, pictures or messages, for example to a radio, television or mobile/cell phone （传输声音、图像或其他信息的电波）信号 ◆ TV signals 电视信号 ◆ a high-frequency signal 高频信号 ◆ a radar signal 雷达信号 ◆ to detect/pick up signals 探测╱收到信号 ◆ to emit a signal 发射信号 ◆ I couldn't get a signalon my cell phone. 我的手机接收不到信号了。 verb ★ ( -ll- , US -l- ) 1 ★ [intransitive , transitive ] to make a movement or sound to give sb a message, an order, etc. 发信号；发暗号；示意 ◆ Don't fire until I signal. 等我发出信号后再开枪。 ◆ Did you signal before you turned right? 右转弯前你示意了吗？ signal(to sb) (for sth) ◆ He signalled to the waiter for the bill. 他示意服务员结账。 signalto/for sb to do sth ◆ He signalled to us to join him. 他示意要我们去他那儿。 signalsb to do sth ◆ She signalled him to follow. 她示意他跟她走。 signalsth ◆ The referee signalled a foul. 裁判鸣哨示意犯规。 signal(that)… ◆ She signalled (that) it was time to leave. 她示意该走了。 signalwhich, what, etc… ◆ You must signal which way you are going to turn. 你要朝哪个方向转，必须发出信号。 2 [transitive ] signalsth to be a sign that sth exists or is likely to happen 标志；表明；预示 SYN indicate ◆ This announcement signalled a clear change of policy. 这个声明显示政策有明显的改变。 ◆ The scandal surely signals the end of his political career. 毫无疑问，这桩丑闻预示他的政治生涯就此结束。 3 [transitive ] to do sth to make your feelings or opinions known 表达；表示；显示 signalsth ◆ He signalled his discontent by refusing to vote. 他拒绝投票以示不满。 signal(that)… ◆ She has signalled (that) she is willing to stand as a candidate. 她表示愿意作为候选人参加竞选。 adjective [only before noun ] ( formal) important and noticeable 重大的；显要的 ◆ a signal honour 极大的荣誉 ▶ sig·nal·ly / ˈsɪɡnəli ; NAmE ˈsɪɡnəli / adverb ◆ They have signally failed to keep their election promises. 他们显然没有履行自己的竞选承诺。 sig·nal / ˈsɪɡnəl ; NAmE ˈsɪɡnəl / sig·nal·ly / ˈsɪɡnəli ; NAmE ˈsɪɡnəli /
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