creep up
US /kriːp ʌp/
UK /kriːp ʌp/

1.
تسلل, تسلل ببطء
to move slowly and quietly so as not to be noticed
:
•
The cat crept up on the bird.
تسللت القطة إلى العصفور.
•
Prices have been creeping up steadily.
الأسعار تتسلل ببطء وثبات.
تسلل, تسلل ببطء
to move slowly and quietly so as not to be noticed