Thus is common for most of these. They originally had one meaning, but were then corrupted by people misunderstanding them. For example "moot" originally refer

Thus is common for most of these. They originally had one meaning, but were then corrupted by people misunderstanding them. For example "moot" originally referred to a meeting of a local (town) council http://www.phrases.org.uk/meanings/moot-point.html http://www.phrases.org.uk/meanings/moot-point.html