get behind

get behind  {v.}

1. To go too slowly: be late; do something too slowly.

The post office got behind in delivering Christmas mail.

Syn.: FALL BEHIND. Contrast: KEEP UP.

2.  {informal} To support; help.

* /A club is much better if members get behind their leaders.

We got behind Mary to be class president.

Compare: BACK OF (3).

3.  {informal} To explain; find out the reason for.

The police are questioning many people to try and get behind the bank robbery.

Syn.: GET TO THE BOTTOM OF.