get behind
To go too slowly: be late; do something too slowly.
The post office got behind in delivering Christmas mail.
If you get behind in your car payments, the finance company may repossess it from you.
To support; help.
A club is much better if members get behind their leaders.
We got behind Mary to be class president.
To explain; find out the reason for.
The police are questioning many people to try and get behind the bank robbery.
hang back
hang off
hang behind
To stay some distance behind or away, be unwilling to move forward.
Mary offered the little girl candy, but she was shy and hung back.
To hesitate or be unwilling to do something.
Lou wanted Fred to join the club, but Fred hung off.
leave behind
Abandon.
Refugees on the run must sometimes leave old and sick people behind.
To forget; go away without.
We had reached our car when we noticed that we had left our keys behind.
power behind the throne
The person with the real power backing up the more visible partner (usually said about the wives of public figures).
It is rumored that the First Lady it the power behind the throne in the White House.
wet behind the ears
Not experienced; not knowing how to do something; new in a job or place.
The new student is still wet behind the ears; he has not yet learned the tricks that the boys play on each other.