The idiom "cold fish" has its roots in the early 20th century and it likely stems from the association of fish with cold-blooded animals that do not exhibit warm emotions or expressions. It is used to describe someone who seems unfeeling, aloof, or indifferent, often making it difficult for others to form a close or emotional connection with them.

What is the origin of the idiom "cold fishing" and when to use it?

英語での「cold fish」の定義と意味

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