expression, i-adjective
have to; have no choice but to; cannot help doing
Attaches to the -nai stem of a verb (e.g., 行かざるを得ない). Expresses that the action is unavoidable, often due to external circumstances or inner compulsion. More formal and emphatic than ～なければならない.
悪天候のため、試合は中止せざるを得なかった。
Due to the bad weather, we had no choice but to cancel the game.
彼の説明を聞いて、納得
After hearing his explanation, I couldn't help but be convinced.