Verb
unring (third-person singular simple present unrings, present participle unringing, simple past unrang, past participle unrung)
Hypothetically, to reverse the act of ringing, or the consequences of the action.
In a criminal trial, if the prosecution brings in inadmissible evidence that would unfairly prejudice the accused, a mistrial may be warranted. Having the judge admonish the jury to disregard the evidence might not be enough, as the saying goes, 'You can't unring the bell.'
unring (third-person singular simple present unrings, present participle unringing, simple past and past participle unringed)
(transitive, poetic) To remove a ring from.