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English definition of “cog”

cog

noun [C]     /kɒɡ/ US  /kɑːɡ/
one of the tooth-like parts around the edge of a wheel in a machine that fits between those of a similar wheel, causing both wheels to moveMachine parts (also cogwheel) a wheel with cogs around its edge, used to turn another wheel or part in a machineMachine parts
(Definition of cog noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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