ˈfȯlə(r) noun
( -s )
Etymology: Middle English, one that falls, from fallen to fall + -er — more at fall
1. : a logger who fells trees — called also feller
2. : a machine part that acts by falling: as
a. : the activating part of some stop motions
b. : a falling or controlling device (as the hammer in a fulling machine, a tensioning device on a mule-spinning machine, or one of a series of pins in a gill box)