chirk (chûrk)tr. & intr.v. chirked, chirk·ing, chirks To make or become cheerful. Used with up.[Middle English chirken, to chirp, chirrup, from Old English cearcian, to chatter, alteration of cracian, to resound; see crack.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.chirk (t???k) adjshowing a cheery and sprightly dispositionvb1. (intr) to squeal or make a shrill noise2. to (cause to) become happy or cheeryCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014chirk (t??rk) v.t., v.i. Chiefly Dial. to make or become cheerful. [before 1000; Middle English: to creak, chirrup, Old English circian to roar] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.