The idiom "a fine line" originated from the literal concept of a line, which is a narrow and distinct mark or boundary. In a figurative sense, the phrase refers to a subtle or delicate distinction between two similar or closely related things. It is used to highlight the idea that there is a small margin or difference that separates two concepts, actions, or outcomes, often implying that the boundary can easily be crossed or misunderstood.

Визначення та значення слова «a fine line» англійською мовою

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