Englishfor English speakers
defect
Noun
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A defect in something is a mistake or problem that makes the thing not perfect.
This gem has a defect, so it is not worth much.
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A defect is something that is not perfect.
defect
Verb
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If you defect from a group or country, you leave it and join a different side.
In 1961, defected from Russia.
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.