run up on

English

Etymology

From run up +‎ on.

Verb

run up on (third-person singular simple present runs up on, present participle running up on, simple past ran up on, past participle run up on)

  1. (transitive) To approach with speed or forceful intensity
    Hey, don't run up on me like that while my back's turned...I might accidentally deck you.
  2. (transitive) To confront with hostility
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