- (idiomatic) The boss, the leader.
- Only the top banana can make a decision of that magnitude.
- (idiomatic, dated) The principal comedian in a vaudeville or burlesque show.
- He was hilarious, and remained the top banana on the tour for years.
- big cheese
- big enchilada
- big kahuna
- big wheel
- grand poobah
- head honcho
- muckety muck
- top dog