Englishfor English speakers
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.
contrast
Noun
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Contrasts are the differences you find when you compare something or someone.
When comparing English and Japanese, there are many contrasts but also a large number of similarities.
Married life is a sharp contrast to the life of a single person.
contrast
Verb
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If you contrast two things, you look for or explain the differences between them.
It's difficult not to contrast the good things he says with the terrible way he acts.