水みず心ごころ

noun

knowing how to swim

Refers to the ability or knowledge of swimming. Often used in contexts where one's swimming ability is relevant.

• 彼かれは水みず心ごころがあるので、海うみでも安あん心しんだ。

  He knows how to swim, so he's safe even in the ocean.

expression

kindness begets kindness; you scratch my back and I'll scratch yours

Proverbial expression, abbreviated from 魚心あれば水心. Implies mutual goodwill or reciprocal favors.

See also: 魚心あれば水心

• 「水みず心ごころあれば魚うお心ごころ」ということわざがある。

  There is a proverb: 'If the water has a mind, the fish have a mind too' (kindness begets kindness).