creep up
1. To approach someone or something slowly and often stealthily. I crept up behind my brother and startled him. Ah, you scared me! What are you doing, creeping up out of nowhere like that? You creep up on Bill and put the "Kick me!" sign on his back.
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. Aw man, my wife's birthday crept up on me this year. I just realized that it's Friday and I have nothing for her.
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