Source : Webster's Revised Unabridged Dictionary (1913)

Sup \Sup\, n.
   A small mouthful, as of liquor or broth; a little taken with
   the lips; a sip.

         Tom Thumb had got a little sup.          --Drayton.

Sup \Sup\, v. i. [See {Supper}.]
   To eat the evening meal; to take supper.

         I do entreat that we may sup together.   --?

Sup \Sup\, v. t.
   To treat with supper. [Obs.]

         Sup them well and look unto them all.    --Shak.

Sup \Sup\, v. t. [imp. & p. p. {Supped}; p. pr. & vb. n.
   {Supping}.] [OE. soupen to drink, AS. s?pan; akin to D.
   zuipen, G. saufen, OHG. s?fan, Icel. s?pa, Sw. supa, Dan.
   s["o]be. Cf. {Sip}, {Sop}, {Soup}, {Supper}.]
   To take into the mouth with the lips, as a liquid; to take or
   drink by a little at a time; to sip.

         There I'll sup Balm and nectar in my cup. --Crashaw.

Source : WordNet®

sup
     n : a small amount of liquid food; "a sup of ale" [syn: {swallow}]
     [also: {supping}, {supped}]

sup
     v : take solid or liquid food into the mouth a little at a time
         either by drinking or by eating with a spoon
     [also: {supping}, {supped}]