topdog

top dog

noun
1.
a person, group, or nation that has acquired a position of highest authority.
2.
the winner of a competition or rivalry; champion: He was determined to be top dog at the swimming meet.
3.
Animal Behavior. the alpha male or alpha female in a dominance hierarchy.

Origin:
1885–1900

top-dog, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
top dog
 
n
informal the leader or chief of a group

Collins English Dictionary - Complete & Unabridged 10th Edition
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