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.
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.
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Source: A Dictionary of American Idioms