The coach gave the boy a high-five.
Meaning: This means that the coach showed his approval and congratulations to the boy by raising his hand and slapping the boy's palm.
Choice of Words: Coach is a person who teaches and trains a sports team. Gave is the past tense of the verb give, which means to transfer something to someone. High-five is a gesture where two people raise their hands and slap each other's palms. This sentence describes the coach's action of giving the boy a high-five.
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Related Expressions