Meaning of “dishonour” - Learner’s Dictionary

dishonour

verb [ T ] UK (US dishonor) uk us /dɪˈsɒnər/

to show no respect for someone or something by behaving badly:

He felt that he had dishonoured his country.

to refuse to accept or pay a cheque or a bill (= amount charged)

(Definition of “dishonour verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)