Englishfor English speakers
attention
Noun
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If you pay attention to something, you focus your mind on it.
Pay attention to me when I'm speaking to you.
He waved to draw attention to himself.
She couldn't keep her attention on her books.
signal
Noun
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A picture, or a light, or a movement of a hand, or other thing that tells people to do something.
When I make this signal with my hand, everybody walk to the front of the room.
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A picture, or a light, or a movement of a hand, or something else that lets someone recognize another person, a ship, an airplane or something else.
The sailor saw the signal on the other ship and so recognized it was the enemy.
signal
Verb
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When someone or something signals to someone, they use a signal to tell the person something.
The red light signals to the cars to stop.