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Related to chirk: chirk up
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.
showing a cheery and sprightly disposition
1. (intr) to squeal or make a shrill noise
2. to (cause to) become happy or cheery
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.