1to overtake; to catch up with
2to hurry; to rush
3to try to catch (the bus etc)
4to drive (cattle etc) forward; to drive (sb) away
5to avail oneself of (an opportunity)
6until; by (a certain time)
Example
wǒ我qǐ起liǎo了gè个dà大zǎo早wèi le为了gǎn赶dì第yī一bān班huǒ chē火车。
我起了个大早为了赶第一班火车。
I got up early enough to catch the first train.