水心 みずごころ すいしん knowing how to swim n returning a favor n middle of a body of water (e.g. a lake, a river) n Advanced ➥
魚心あれば水心 うおごころあればみずごころ 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; mutual back-scratching exp proverb Advanced ➥