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1. Oxford American Dictionary

   signal

   • IPA[ˈsiɡn(ə)l]

   美式

   • n.
     a gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned；an indication of a state of affairs
   • v.
     transmit information or instructions by means of a gesture, action, or sound；instruct (someone) to do something by means of gestures or signs rather than explicit orders

   • noun: signal, plural noun: signals

2. • 釋義

   n.

   名詞

   • 1. a gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned the firing of the gun was the signal for a chain of beacons to be lit the policeman raised his hand as a signal to stop 同義詞 gesture, sign, wave, gesticulation, cue, ... 更多prompt, indicator, indication, communication, message, alert, warning, tip-off, action, movement, motion, body language, kinesics
   • ▪ an indication of a state of affairs the markets are waiting for a clear signal about the direction of policy 同義詞 indication, sign, symptom, hint, pointer, ... 更多suggestion, intimation, clue, manifestation, demonstration, token, testimony, evidence, attestation, proof
   • ▪ an event or statement that provides the impulse or occasion for something specified to happen the champion's announcement that he was retiring was the signal for scores of journalists to gather at his last match 同義詞 cue, prompt, occasion, green light, incentive, ... 更多impetus, impulse, stimulus, informalgo-ahead
   • ▪ a prearranged convention of bidding or play intended to convey information to one's partner.
   • 2. an electrical impulse or radio wave transmitted or received equipment for receiving TV signals
   • 3. an apparatus on a railroad, typically a colored light or a semaphore, giving indications to train engineers of whether or not the line is clear the driver of the mail train overran a signal at danger and ran into the rear of an express

   v.

   動詞

   • 1. transmit information or instructions by means of a gesture, action, or sound hold your fire until I signal
   • ▪ instruct (someone) to do something by means of gestures or signs rather than explicit orders she signaled Charlotte to be silent 同義詞 gesture, sign, give a sign to, indicate, direct, ... 更多motion, gesticulate, wave, beckon, nod
   • ▪ (of a cyclist, motorist, or vehicle) indicate an intention to turn in a specified direction using an extended arm or flashing indicator Stone signaled right the truck signaled to turn left
   • ▪ indicate the existence or occurrence of (something) by actions or sounds they could signal displeasure by refusing to cooperate she gave a glance that signaled that her father was being secretive 同義詞 indicate, show, express, communicate, announce, ... 更多proclaim, declare, pronounce