The idiom "kiss one's ass" originated in colloquial English and is considered vulgar or offensive. It dates back to the early 20th century and is derived from the literal act of kissing someone's buttocks as an act of subservience or flattery. When used idiomatically, it refers to ingratiating oneself to someone in a servile or obsequious manner, often to gain favor or avoid punishment.

英語での「kiss one's ass」の定義と意味

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