The Collaborative International Dictionary
Disavaunce
Disavaunce \Dis`a*vaunce"\, v. t. [Cf. Disadvance.]
To retard; to repel; to do damage to. [Obs.]
--Chaucer.
Wiktionary
disavaunce
vb. (context obsolete English) To retard; to repel; to do damage to.