creep up
US /kriːp ʌp/
UK /kriːp ʌp/

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.
貓悄悄地靠近了那隻鳥。
•
Prices have been creeping up steadily.
物價一直在穩步上漲。
悄悄靠近, 逐漸上漲
to move slowly and quietly so as not to be noticed