Source : Webster's Revised Unabridged Dictionary (1913)

Flush \Flush\, a.
   1. Full of vigor; fresh; glowing; bright.

            With all his crimes broad blown, as flush as May.
                                                  --Shak.

   2. Affluent; abounding; well furnished or suppled; hence,
      liberal; prodigal.

            Lord Strut was not very flush in ready. --Arbuthnot.

   3. (Arch. & Mech.) Unbroken or even in surface; on a level
      with the adjacent surface; forming a continuous surface;
      as, a flush panel; a flush joint.

   4. (Card Playing) Consisting of cards of one suit.

   {Flush bolt}.
      (a) A screw bolt whose head is countersunk, so as to be
          flush with a surface.
      (b) A sliding bolt let into the face or edge of a door, so
          as to be flush therewith.

   {Flush deck}. (Naut.) See under {Deck}, n., 1.

   {Flush tank}, a water tank which can be emptied rapidly for
      flushing drainpipes, etc.