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Từ điển Oxford Advanced Learner 8th
cog
cog [cog cogs] BrE [kɒɡ] NAmE [kɑːɡ] noun
1. one of a series of teeth on the edge of a wheel that fit between the teeth on the next wheel and cause it to move
2. = ↑cogwheel
Idiom: ↑cog in the wheel
Word Origin:
Middle English: probably of Scandinavian origin and related to Swedish kugge and Norwegian kug.
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