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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.]
showing a cheery and sprightly disposition
1. (intr) to squeal or make a shrill noise
2. to (cause to) become happy or cheery
v.t., v.i. Chiefly Dial.
to make or become cheerful.
[before 1000; Middle English: to creak, chirrup, Old English circian to roar]