DNR noun 2phrase 1 noun2 •Initialism of digital noise reduction. •Initialism of do not rent (a blacklist of individuals who are forbidden from renting a property). phrase1 •Initialism of do not resuscitate, a legal document by which a patient may direct which medical procedures they do and do not wish to undergo in the case that they are incapacitated.The hospital ignored the DNR order because it wasn't entered on the charts.