ichidan verb, transitive verb
Used for actively stopping something undesirable from happening or progressing, often with a sense of effort or resistance.
彼は必死に敵の侵入を防ぎ止めた。
He desperately prevented the enemy from invading.
感染の拡大を防ぎ止める対策が必要だ。
Measures to stop the spread of infection are necessary.