expression, ichidan verb
persevere; keep at it; work hard without rest
Implies pushing oneself to the limit, often to the point of exhaustion. Used when someone works doggedly despite fatigue.
See also: 根 (こん)
彼は根を詰めて働きすぎて、体を壊した。
He worked too hard without rest and ruined his health.
試験前は根を詰めて勉強する学生が多い。
Many students study relentlessly before exams.