티끌 모아 태산이에요 / 티끌 모아 태산이라고
every little bit counts; many a little makes a mickle
Example
티끌 모아 태산이라고 매일 조금씩 저금하고 있어요.
Every little bit adds up, so I'm saving a little every day.
Word parts
태 great+산 mountain
Literally 'gather specks of dust and you get a great mountain'.