막으면

block, stop, prevent

→ 막다
verb Rare #23,774
block, stop, prevent This is the conditional form: “if [someone] blocks/stops/prevents.”
KO: 문을 막으면 사람들이 못 들어와요.
EN: If you block the door, people can’t come in.
Conjugation of 막다
Conditional
막으면

지금 안 막으면 우리 다 죽어

If we don't stop it now, we're all going to die.

— 데드풀과 울버린 (2024)