What is "flush bolt"

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.

   1. A screw bolt whose head is countersunk, so as to be flush with a surface.

   2. 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.