To creep up on is to approach unnoticed, as age or a deadline does. Creep up on you slowly.
The lack of any single moment is what makes it work, since nothing announces itself. Costs creep up on a project in small amounts that nobody objects to one at a time.
1phrasecreep up onTo approach unnoticed, as age or a deadline does.
“The deadline will creep up on anybody who does not write it down.”
creep up on is a phrase.
Practised in Phrasal Verbs