be on (one's) side
To be 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 that stellar legal team is on her side, then there's a chance she might actually win this case. Of course I'm on your side, I'm your husband! I just don't know that this is the best way to go about things.
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