wurmen

Etymology
From. Equivalent to.

Verb

 * 1)  to worm, move by dragging one's body around
 * 2)  to squeeze, to wriggle

Etymology
From. Formally already in and, but with unrelated senses. Since the 15th century “to have worms, be wormridden”. The contemporary meaning since the later 18th century, seemingly popularised in part by. Evoking the idea of a nibbling worm in one’s mind or conscience, perhaps remotely based on 66:24,  9:44 (“where their worm dieth not”, of the continuous agony and regret of the sinners in hell).

Verb

 * 1)  to cause a not necessarily strong but continuous feeling of anger, worry, or regret in someone; to rankle