'Forcer' definitions:

Definition of 'Forcer'

From: GCIDE

Forcer \For"cer\, n.
1. One who, or that which, forces or drives. [1913 Webster]
2. (Mech.) (a) The solid piston of a force pump; the instrument by which water is forced in a pump. (b) A small hand pump for sinking pits, draining cellars, etc. [1913 Webster]