赶不上

can't keep up with / can't catch up with / cannot overtake

to overtake / to catch up with / to hurry / to rush / to try to catch (the bus etc) / to drive (cattle etc) forward / to drive (sb) away / to avail oneself of (an opportunity) / until

to overtake; to catch up with / to hurry; to rush / to try to catch (the bus etc) / to drive (cattle etc) forward; to drive (sb) away / to avail oneself of (an opportunity) / until; by (a certain time)

no; not so / (bound form) not; un-

used in 上聲|上声[shang3 sheng1]

(bound form) up; upper; above; previous / first (of multiple parts) / to climb; to get onto; to go up / to attend (class or university) / (directional complement) up / (noun suffix) on; above