Sentence:  “I <WSD>don't</WSD> know how you and the ‘head,' as you call him, will get on, but I do know that if you call my duds a ‘livery' again there'll be trouble. […]” 
Meaning of the word marked with <WSD> tags:  do not (negative auxiliary<ref>Arnold M. Zwicky and Geoffrey K. Pullum, [http://www.stanford.edu/~zwicky/ZPCliticsInfl.pdf "Cliticization vs. Inflection: English "n't], "Language" '''59''' (3), 1983, pp. 502-513</ref>)