1 informal especially American English
someone who you dislike extremely:
Get lost, you little creep!
2 British English informal
someone who tries to make you like them or do things for them by being insincerely nice to you:
Don't try and flatter her - she doesn't approve of creeps.
if a person or place gives you the creeps, they make you feel nervous and a little frightened, especially because they are strange:
That house gives me the creeps.
when something gradually starts to go beyond what it was intended to deal with or include:
He denied that giving civilian tasks to the NATO forces was a case of mission creep.