Englishfor English speakers
perpendicular
Adjective
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Perpendicular means "at a ninety degree angle to".
sign
Noun
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A flat thing with a few words or pictures on it to tell people something.
I saw a stop sign, so I stopped the car.
sign
Verb
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When someone signs a piece of paper, they write their signature on it.
They signed a contract saying exactly who would do the work and how much money they would be paid.
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If a company signs someone, they hire them to work.