cold fish

1. (idiomatic)A heartless individual; a person lacking empathy and emotion.

   Griesgram

   суха́рьsuxárʹ

2. (slang)A sexual partner who, during sex, lacks vigor or emotional reciprocity.

1. In cold weather fish stay fresh for longer.

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2. He's such a cold fish.

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3. Because warm water sinks in very cold freshwater, fish often gather in groups near the bottom.

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regular