If someone refuses to define their terms, this is evidence that they either do not understand the concept well or that they are not interested in rationally changing your mind. If you think the former is a better description, then pointing out that the definition is inadequate is the best response. Practically, you should try to avoid using tones that make this sound like a “gotcha” question. If you are genuinely confused, you should be able to express that fact.
If you think the latter is better description (i.e. the debate partner is using a semantic stop sign or similar maneuver), then your best action is to terminate the debate. You won’t make any progress until your debate partners are willing to engage the issues, especially any weaknesses in their arguments.
In short, you can’t force people to define their terms. You can point out the failure to provide definitions, or you can leave.
If someone refuses to define their terms, this is evidence that they either do not understand the concept well or that they are not interested in rationally changing your mind. If you think the former is a better description, then pointing out that the definition is inadequate is the best response. Practically, you should try to avoid using tones that make this sound like a “gotcha” question. If you are genuinely confused, you should be able to express that fact.
If you think the latter is better description (i.e. the debate partner is using a semantic stop sign or similar maneuver), then your best action is to terminate the debate. You won’t make any progress until your debate partners are willing to engage the issues, especially any weaknesses in their arguments.
In short, you can’t force people to define their terms. You can point out the failure to provide definitions, or you can leave.