[General] get behind the idea

[triet96]

I don't understand this sentence: "Business owners often get behind the idea that they should be averaging a dollar per month for every person on their list."
What is the meaning of the phrase "to get behind the idea that".
Thank you

 

[JMurray]

not a teacher

To "get behind" something in this sort of context, usually means to support, endorse or encourage it.