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Related to on side: on site
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.
on sidesupporting 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.