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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.