This is the 14267th most frequent Korean word.
모으면
"모으면" means "if/when (someone) gathers or collects."
In this sentence, '모으면' is used to refer to the act of gathering or saving something, specifically money, for a purpose.
돈을 모으면 여행을 갈 수 있어요.
If you save money, you can go on a trip.
Here, '모으면' is used to indicate assembling or bringing people together.
사람들을 모으면 큰 소동이 생길 수도 있어요.
If you gather people, it could cause a big commotion.
In this case, '모으면' is used to describe the action of collecting or gathering trash for a beneficial outcome.