top banana

noun
🔊/ˌtɒp bəˈnɑːnə/
🔊/ˌtɑːp bəˈnænə/
[singular] (especially North American English, informal)
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  1. a person who has the most important job or position
    • He used to be top banana at a supermarket chain.他曾经是一家超市连锁店的顶级香蕉。
    compare second banana