魚心あれば水心あり
魚心有れば水心有り
うおこころあればみずこころあり
Expressions (phrases, clauses, etc.)
see: 魚心あれば水心
idiomatic expression
if you do a favor for somebody, you will get a return favor
if a fish is friendly toward water, water will be kind to the fish too
you scratch my back and I'll scratch yours
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