creep up on

US /kriːp ʌp ɑːn/
UK /kriːp ʌp ɑːn/
"creep up on" picture
1.

悄悄靠近, 不知不覺地發生

to approach someone or something slowly and quietly so as not to be noticed

:
The cat tried to creep up on the bird.
貓試圖悄悄靠近那隻鳥。
Don't let problems creep up on you; address them early.
不要讓問題悄悄出現;及早解決它們。