creep up on/behind someone
phrasal verb with creep verb [ I usually + adv/prep ] uk/kriːp/ us/kriːp/ crept | crept
从…后面悄悄凑上去；蹑手蹑脚地从身后靠近…
to surprise someone and move closer to them without being seen or heard
Don't creep up on me like that! 别再那样悄没声地凑上来吓我一跳！
We crept up behind her and yelled "Boo!" 我们蹑手蹑脚靠近她身后，大喊一声“哇！”。