to torment oneself with or suffer from disturbing thoughts; fret.

to move with effort

an old car worrying uphill.

to torment with cares, anxieties, etc.; trouble; plague.

to seize, esp. by the throat, with the teeth and shake or mangle, as one animal does another.

to harass by repeated biting, snapping, etc.

a worried condition or feeling; uneasiness or anxiety.

a cause of uneasiness or anxiety; trouble.

act of worrying.

Fox Hunting . the action of the hounds in tearing to pieces the carcass of a fox. ?

worry along or through, Informal . to progress or succeed by constant effort, despite difficulty

to worry through an intolerable situation.