To worry.noun
A worry or care.[From Middle English carken (to load or burden), from Norman French carquier, from Latin carricare. Ultimately from Indo-European root kers- (to run) that's also the source of car, career, carpenter, occur, discharge, and caricature. Why caricature? Because a caricature is a loaded or distorted picture of someone.]
Today's word in Visual Thesaurus: http://visualthesaurus.com/?w1=cark
"Crows in hundreds carking desolately from the blasted white skeletons of dead trees."
Colleen McCullough; The Thorn Birds; HarperCollins Publishers; 1977.
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