overnight telegram

noun
  1. a type of domestic telegram sent at a reduced rate with a minimum charge for 10 words or less and accepted until midnight for delivery the following day.
  2. the service offering such a telegram. Abbreviation: OTCompare fast telegram, personal-opinion telegram.

Origin of overnight telegram

First recorded in 1950–55
Formerly night letter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018