sneak up

phrasal verb
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sneak up (on somebody/something)
  1. to move towards somebody very quietly so that they do not see or hear you until you reach them偷偷走近
    • He sneaked up on his sister and shouted ‘Boo!’他偷偷溜到妹妹身边,然后大喊一声 “嘿!”🔊🔊