When we debate a problem one of the factors that can underpin a disagreement is a mutual failure to understand what precisely is being discussed. The person speaking may intend a word or phrase to mean one thing and the listener may understand it to mean something else.
The problem arises because it will generally be obvious to the speaker what they intend their words to mean and it will be equally obvious to the listener that their words have another meaning. We understand words in part by the web of associations they create in our minds but this web will differ from person to person. To some people picturing the word spider will bring them out in a cold sweat, while for others it will conjure up associations of an interesting and harmless animal. It is this difference in associations that can lead to misunderstandings in the meanings of words.
If you suspect that someone you are debating with might mean something different from what you understand, ask them to stipulate what precisely it is that they mean. Point out to them that simply because it is obvious to them what they mean, this does not mean that it will be obvious to everybody else.