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noun [C ] B2 • synonyms: envoy, representative, promoter • ambassador to France/UN; brand/cultural ambassador; appoint/serve as ambassador • freq in AmE: 8/10
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a high-ranking official who represents their country abroad, especially in diplomacy; also used metaphorically for someone who promotes or represents a cause, brand, or idea
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noun [U ] B2–C1 US (UK also automatic gearbox) • synonyms: auto, self-shifting transmission • automatic transmission car/system/driver; gear shifts automatically; ease/convenience/smoothness • freq in AmE: 8/10
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a type of gearbox that automatically changes gears based on speed and load, without requiring the driver to manually operate a clutch or gear stick
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