creep up on
US /kriːp ʌp ɑːn/
UK /kriːp ʌp ɑːn/

1.
살금살금 다가가다, 슬그머니 다가오다
to approach someone or something slowly and quietly so as not to be noticed
:
•
The cat tried to creep up on the bird.
고양이가 새에게 살금살금 다가가려고 했다.
•
Don't let problems creep up on you; address them early.
문제가 슬그머니 다가오도록 두지 말고, 일찍 해결해.