The Collaborative International Dictionary
Begnaw
Begnaw \Be*gnaw"\, v. t. [p. p. Begnawed, (R.) Begnawn.] To gnaw; to eat away; to corrode.
The worm of conscience still begnaw thy soul.
--Shak.
Wiktionary
begnaw
vb. (context transitive archaic English) To gnaw; to eat away at.