Senses
赶不上/ 趕不上 to be unable to catch up
to be unable to catch up with or keep up with; to fall behind
赶不上/ 趕不上 to be unable to make it
to be unable to make it in time for an event or transport; to miss a bus or flight
赶不上/ 趕不上 to be inferior to
to be unable to compare with; to not be as good as
赶不上/ 趕不上 to miss an opportunity
to be unable to meet with or chance upon a certain timing or opportunity