Englishfor English speakers
tooth
Noun
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A tooth is a hard, white thing in your mouth. You use your teeth to chew food.
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A tooth is a sharp point sticking out of something and forms a row of sharp objects for cutting.
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A tooth is a rounded point on a gear that is used to transmit or receive force and motion to other gears.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.