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.
symptom
Noun
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A symptom is a sign or indication of something, usually an illness.
He began to show symptoms of chicken pox a few days ago.