cark

To burden or be burdened with trouble; worry.

A worry; a trouble: carks and cares.

[Middle English carken, from Norman French carquier, to burden, load, from Late Latin carricāre. See cargo.]

verb

1. To cause anxious uneasiness in: ail, concern, distress, trouble, worry. See concern/unconcern.
2. To focus the attention on something moodily and at length: brood, dwell, fret, mope, worry. Informal stew. See concern/unconcern, thoughts.

The verb has one meaning:

Meaning #1: disturb in mind or make uneasy or cause to be worried or alarmed
  Synonyms: perturb, unhinge, disquiet, trouble, distract, disorder