꽉 잡고

hold on tight

→ 꽉
phrase Rare #30,264
hold on tight 꽉 means “tightly,” and 잡고 means “hold and”; -고 connects this action to what follows.
KO: 버스가 출발하니까 손잡이를 꽉 잡고 있어.
EN: The bus is about to leave, so hold on tight to the handrail.

산티아고가 꽉 잡고 있잖아

Santiago has a tight grip on it.

— 아나콘다 (2025)

지지, 꽉 잡고 있지?

Jiji, are you holding on tight?

— 마녀배달부 키키 (1989)

꽉 잡고 똑바로 세워

Hold it tightly and stand it up straight.

— 대부 (1972)