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Top dog
01
a person who holds the highest rank in a particular group or organization
Idiom
Informal
What is the origin of the idiom "top dog" and when to use it?
The idiom "top dog" comes from the world of dog fighting, where the top dog was the most successful or dominant fighter. It is typically used to describe a person or organization that is dominant or successful in their field.
Examples
By the time they realized they were n't the top dog anymore, it was too late to catch up.
