plus-one

or plus one

[ pluhs-wuhn ]
/ ˈplʌsˈwʌn /

noun

a person who accompanies someone to a party or other event when the invitation allows the invited guest to bring another person: I phoned Tom to ask if he would be my plus-one at the gala.

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disgruntle

Origin of plus-one

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for plus-one

plus-one

noun

informal a person who accompanies an invited person to a social function
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