Source : Webster's Revised Unabridged Dictionary (1913)

Dop \Dop\, Doop \Doop\, n.
   A little copper cup in which a diamond is held while being
   cut.

Dop \Dop\, v. i. [Cf. {Dap}, {Dip}.]
   To dip. [Obs.] --Walton.

Dop \Dop\, n.
   A dip; a low courtesy. [Obs.] --B. Jonson.