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English definition of “gear”

gear

  /ɡɪər/ noun
the parts in a car or bicycle that control how fast the wheels turn: I have a mountain bike with 21 gears. I changed gear.
first, second, third, etc. gear a particular position of the gears in a car, bicycle, etc. that controls how fast the wheels turn: I left the car in first gear.
[no plural] the clothes and things that you use for a particular purpose: sports gear
(Definition of gear noun from the Cambridge Essential Dictionary © Cambridge University Press)

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