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signal

From Wiktionary

A picture, or a light, or a movement of a hand, or other thing that tells people to do something.
When I make thissignal with my hand, everybody walk to the front of theroom.
A picture, or a light, or a movement of a hand, or something else that lets someonerecognize another person, aship, anairplane or something else.
The sailor saw thesignal on the other ship and so recognized it was theenemy.

Plain form
signal

Third-person singular
signals

Past tense
signaled

Past participle
signaled

Present participle
signaling

Plain form
signal

Third-person singular
signals

Past tense
signalled

Past participle
signalled

Present participle
signalling

(transitive) When someone or somethingsignals to someone, they use a signal to tell the person something.
The red lightsignals to the cars to stop.

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