line someone or something up behind someone or something
to put people or things into a line behind someone or something. Please line all the children up behind the tallest child. Line up everyone behind the curtain.
line someone up behind someone or something
Fig. to organize people in support of someone or something. I will see if I can line a few supporters up behind our candidate. I can line up everyone behind you.
line up behind someone or something
1. to form or get into a line behind someone or something. Please line up behind Kelly. Please go and line up behind the sign.
2. and get behind someone or something to organize in support of someone or something. We all got behind Todd and got him elected. We got behind the most active political party.