What is Deface?

Legal Definition
To mar or destroy the face (that is, the physical appearance of written or inscribed characters as expressive of a definite meaning) of a written instrument, signature, inscription, etc., by obliteration, erasure, canceliation or superinscription, se as to render it illegible or unrecognizable. Linney v. State, 6 Tex. 1, 55 Ain. Dec. 756. See Cancel.
-- Black's Law Dictionary