a sign used in reply to another sign.
Military. a secret sign that must be given by authorized persons seeking admission through a guarded area.
a signature added to another signature, especially for authentication.
to sign (a document that has been signed by someone else), especially in confirmation or authentication.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use countersign in a sentence
But since you have dined rather heartily, you kiss her upon the forehead merely, not feeling able to countersign your opinions.The Petty Troubles of Married Life, Complete | Honore de Balzac
I had no pass to get back with, and didn't know the countersign, but I bluffed through all right.In the Ranks of the C.I.V. | Erskine Childers
I'se under the orders of de United States Guvement, and dem orders is to let nobody parss here what can't gib de countersign.
He is not obliged to know his own officers or comrades, or the commanding general, only through the means of the countersign.Nurse and Spy in the Union Army | S. Emma E. Edmonds
No Captain; no Colonel; no General, dare disobey it, unless he has his pass or can give the "countersign."A History of the Ninth Regiment, Illinois Volunteer Infantry | Marion Morrison
British Dictionary definitions for countersign
(tr) to sign (a document already signed by another)
Also called: countersignature the signature so written
a secret sign given in response to another sign
mainly military a password
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