creep up

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

acercarse sigilosamente, subir poco a poco

to move slowly and quietly so as not to be noticed

:
The cat crept up on the bird.
El gato se acercó sigilosamente al pájaro.
Prices have been creeping up steadily.
Los precios han estado subiendo constantemente.