This is the 11874th most frequent Korean word.
넘어지자
"넘어지자" means "let's fall down."
The word '넘어지자' is used here to indicate the action of falling down, suggesting an instantaneous reaction to tripping.
넘어지자마자 손을 땅에 짚었다.
As soon as I tripped, I touched the ground with my hand.
In this sentence, '넘어지자' conveys the cause (falling down) leading to the resultant dirty clothes.
산길에서 넘어지자 옷이 더러워졌다.
When I fell on the mountain path, my clothes got dirty.
The word '넘어지자' illustrates a sequence of events, starting with the fall and followed by assistance from others.