天火字典

英日字典：飛ぶ鳥跡を濁さず

飛ぶ鳥跡を濁さず

とぶとりあとをにごさず

(exp) (See 跡を濁す・あとをにごす,立つ鳥跡を濁さず) it is simply common courtesy to clean up after yourself
a bird does not foul the nest it is about to leave
on leaving a place one should see that all is in good order

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