expression, godan verb (-ru)
be in a comfortable situation; rest on one's laurels; be coddled
Idiomatic expression literally meaning 'to soak in lukewarm water'. Used to describe a person who is content with an easy, unchallenging situation and makes no effort to improve or change. Often carries a negative connotation of complacency or being spoiled.
今の仕事にぬるま湯につかっていないで、もっと自分を成長させたい。
Instead of just coasting in my current job, I want to push myself to grow more.
He's living off his parents and taking it easy.