The term CARK is a verb meaning to WORRY or be anxious. It can be expressed in two different ways, either as a five-letter word, 'WORRY', or as a four-letter word, 'FRET'. Worrying is a common emotion that people experience when they are uncertain about the future or when they are overwhelmed by a situation. Fretting is a similar emotion, but it is more focused on the present and is often accompanied by feelings of frustration or agitation.