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]
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Nearby words
on sight, on someone's, on someone's back, on someone's coattails, on someone's nerves, on someone's side, on speaking terms, on spec, on standby, on strike, on sufferance
The American Heritage® Idioms Dictionary
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