水みずを得えた魚うお

expression, noun

someone in their element; like a fish in water

Idiomatic expression describing a person who is thriving in a familiar or suitable environment, as if they have come alive. The literal image is 'a fish that has found water'.

• 彼かれは新あたらしい職しょく場ばで水みずを得えた魚うおのように活かつ躍やくしている。

  He is thriving in his new workplace like a fish in water.