A pain in the ass is an idiomatic expression that appeared in mid-20th-century American English to describe a person or thing that causes ongoing annoyance, trouble, or inconvenience. The phrase uses the body part metaphorically: pain in a sensitive area equals constant irritation that's hard to ignore. It isn't sexual in meaning; it's about persistence and frustration. While clearly informal and crude, it's widely used in everyday speech and can range from mildly rude to strongly annoyed depending on tone and context.

What is the origin of the idiom "a pain in the ass" and when to use it?

英語での「a pain in the ass」の定義と意味

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