noun, verb ·Rare ·Advanced level

Definitions

Noun

1. 1
   The functionality or ability to reverse a message transmission Internet, uncountable

Verb

1. 1
   To undo, cancel, or reverse the transmission of a message Internet, transitive

   "To unsend a piece of mail, highlight the mail you wish to unsend and click the Unsend button."

Example

More examples

"To unsend a piece of mail, highlight the mail you wish to unsend and click the Unsend button."

Etymology

From un- (“reversal”) + send.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.