a conventional phrase used at the end of a letter.
Informal. I; myself; me: I'm only in business to profit yours truly.
Origin of yours truly
First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for yours truly
an informal term for I, myself, or me
Word Origin for yours truly
from the conventional closing phrase used at the end of letters
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Idioms and Phrases with yours truly
A closing formula for a letter, as in It was signed “Yours truly, Mary Smith.” [Late 1700s]
I, me, myself, as in Jane sends her love, as does yours truly. [Colloquial; mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.