English

Definition of creep up on phrasal verb from the Oxford Advanced Learner's Dictionary

 

creep up on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to move slowly nearer to somebody, usually from behind, without being seen or heard Don't creep up on me like that!
  2. 2to begin to affect somebody, especially before they realize it Tiredness can easily creep up on you while you're driving.
See the Oxford Advanced American Dictionary entry: creep up on