Definition of top dog noun from the Oxford Advanced Learner's Dictionary


top dog

BrE BrE//ˌtɒp ˈdɒɡ//
; NAmE NAmE//ˌtɑːp ˈdɔːɡ//
[usually singular] (informal)
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a person, group or country that is better than all the others, especially in a situation that involves competition
See the Oxford Advanced American Dictionary entry: top dog