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Definition of on-side:
(adj) :
In the state of being active, functioning or operating.
(adj) :
Happening; taking place; being or due to be put into action.
(adj) :
(informal) Of a person, used to express agreement to or acceptance of a proposal or challenge made by that person; most commonly with subject "you" (see you're on).
(adj) :
(postpositive) Of a stated part of something, oriented towards the viewer or other specified direction.
(adj) :
Fitted; covering or being worn.
(adv) :
To an operating state.