赶不上

1. be unable to catch up with

♦ 他已经走远了, ~了。 He's pretty far away by now and we won't be able to catch up with him.

2. there's not enough time (to do sth.); it's too late (to do sth.)

♦ 离开车只有十分钟, 恐怕~了。 The train is going to leave in ten minutes. I'm afraid we'll be too late.