The most common Korean word for “fall” is 내리다 (naerida). There is one more word with a similar meaning — compare them below. 「fall」는 한국어로 내리다.
to fall; to drop
TOPIK 2 · verb
Words and levels: TOPIK I essentials (National Institute of Korean Language standard curriculum, KOGL Type 1) · examples: Cheesepotato