on (one's) side

on (one's) side

Supportive or in aid of one or one's idea, plan, intention, etc. We're all on your side, Jerry. We just want to see this issue resolved as quickly and easily as possible. If she's going to win this case, she'll need one heck of a legal team on her side.
See also: on, side
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on someone's side

In support of someone's views or interests, as in I'm glad you're on my side in this debate, or With the Canadians on our side, we should be able to persuade the Mexicans of a North American policy . [1300s]
See also: on, side
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

on your side

If something is on your side, it gives you an advantage and helps you to achieve something. We at least have time on our side. There really is no hurry. I have been very lucky this year. Luck seems to be on my side.
See also: on, side
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

on side

supporting or part of the same team as someone else.
1997 Spectator And while clearly ‘on side’ with New Labour, he has never been a closely quartered insider.
See also: on, side
Farlex Partner Idioms Dictionary © Farlex 2017
See also: