Meaning of かっしてもとうせんのみずをのまず in Japanese

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Definition of かっしてもとうせんのみずをのまず

かっしてもとうせんのみずをのまず(kasshitemotousennomizuwonomazu) 【渇しても盗泉の水を飲まず】

(exp) Even if thirsty not to drink from "Robber's Spring"; A proverb meaning not to lower oneself to unjust acts no matter how desperate; (English equivalent) The eagle does not hunt flies