the most influential person in a given field or area
be the leader in your chosen field
At the top of one’s field
person in charge
a successful person
be the undisputed champion
children’s game
He made £3 million before he was 30, so he is the king of the hill in this industry.
She waited years for her novel to be printed, and now someone has bought the film rights, so she’s the king of the hill finally.
It’s going to be hard to beat the reigning kings of the hill. They are invincible.
Jack fell over when they were playing king of the hill at school today. He’s got a big purple bruise on his knee.
It seems like Mo Farah is the king of the castle so far with a huge £300k pay packet before the show has even started.
The two-top set of bidders competing to see who should be king of the castle and who the dirty rascal.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.