(sound, headphones) the active cancellation of outside noise by creation of an inverse waveform to null out noise soundwaves within the subject environment

plural of dumb cancel

plural of mute cancel

(philately) postage stamps not intended for postal use that are pre-cancelled prior to sale to collectors

simple past tense and past participle of cancel out

simple past tense and past participle of cancel out

Third-person singular simple present indicative form of cancel out

present participle of cancel out

(neologism, often derogatory) The cultural phenomenon of publicly shaming, rejecting, and ceasing to provide support to people, companies, stores, etc. that are deemed unacceptable, and calling on others to boycott them.