to catch up; to overtake; to hurry; to rush; to drive away[cedict]
不
bùㄅㄨˋ
(negative prefix); not; no[cedict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]