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Remaining true to the official or agreed upon view, plan, or ideology. We just feel like our spokesperson has to be on message with our organization's strong religious beliefs. The candidate usually stays on message during these interviews, rarely stepping outside of a set of carefully crafted responses, so it was odd to see him go off on such a random, ranting tangent.
on/off ˈmessage(of a politician) stating/not stating the official point of view of their political party: Despite their internal problems, the party maintains a public front of staying on message.
Following a planned set of remarks or positions.