Source : Webster's Revised Unabridged Dictionary (1913)

Daff \Daff\, v. t. [Cf. {Doff}.]
   To cast aside; to put off; to doff. [Obs.]

         Canst thou so daff me? Thou hast killed my child.
                                                  --Shak.

Daff \Daff\, n. [See {Daft}.]
   A stupid, blockish fellow; a numskull. [Obs.] --Chaucer.

Daff \Daff\ (d[.a]f), v. i.
   To act foolishly; to be foolish or sportive; to toy. [Scot.]
   --Jamieson.

Daff \Daff\, v. t.
   To daunt. [Prov. Eng.] --Grose.