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1. To approach someone or something slowly and often stealthily. I crept up behind my brother and startled him.
2. To encroach (upon one or something) gradually over time. It wasn't until I sat down that I realized how much exhaustion had crept up on me. The weeds have been really creeping up on the edge of the yard over the last few years.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
[for darkness] to move gradually and slowly [toward someone or something]. Dusk crept up and swallowed us in darkness.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.