expression, ichidan verb
persevere; keep at something; work hard without rest
Implies pushing oneself beyond normal limits, often to the point of exhaustion. Frequently used in negative contexts or warnings about overwork. Related to the phrase 根を詰める.
See also: 根を詰める
あまり根詰めて仕事をすると体を壊しますよ。
If you work too hard without rest, you'll ruin your health.
彼は試験勉強に根詰めすぎて、風邪をひいた。
He studied so hard for the exam that he caught a cold.