creep up

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

悄悄靠近, 逐漸上漲

to move slowly and quietly so as not to be noticed

:
The cat crept up on the bird.
悄悄地靠近了那隻鳥。
Prices have been creeping up steadily.
物價一直在穩步上漲