ack.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for ack

You know, Ack, the melancholy of it all is that we grew up there.
War Nostalgia Is Leading Veterans to Places Like Syria. One Went Missing There.
Elliot Ackerman
May 3, 2014
A “Cathy” movie, filled with dietary struggles, overbearing mothers, and a script punctuated by a number of “Ack!”
Lights, Camera, Cocktails
Brody Brown
July 22, 2011

You never kin tell how ary one of 'em 'll ack under any succumstances.
Southern Lights and Shadows
Various
"Qu—," said the duck, and he disappeared before he had time to get the "-ack" out of him.
Irish Fairy Tales
James Stephens
McGee asked the Ack Emma who was making a careful check of the plane.
Aces Up
Covington Clarke
But I ain't so much to blame; times you ack like a boy yit, Tom-Jeff.
The Quickening
Francis Lynde
I've been a-nussin' of him and the 'ack most the 'ole night.'
Mr. Sponge's Sporting Tour
R. S. Surtees

British oral code for letter A in wireless and telephone communication, 1898; hence ack-ack "anti-aircraft" (gun, fire, etc.).