Definition of "off-topic" []

• Not related to the matter under discussion. (adjective)

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• "Ok. Sorry for the rant and being slightly off-topic, it just seems inconceivable to me sometimes – though, as I said, I do get the thing about tuition fees."
• "I would ask about "grillades and grits," since I'm not familiar with Louisiana cooking, but I'm afraid that would get us an off-topic lockdown."
• "So my question is why are threads closed when they get off-topic?"