to strike with the nail of a finger snapped from the end of the thumb.

to tap or strike smartly.

to drive by or as by a fillip

Anticipation filliped his passion.

to make a fillip with the fingers.

an act or instance of filliping; a smart tap or stroke.

anything that tends to rouse, excite, or revive; a stimulus

Praise is an excellent fillip for waning ambition.

noun

encouragement , impetus , impulse , incentive , inducement , motivation , prod , push , spur , stimulant , stimulation , stimulator

verb

boost , charge , excite , flip , incentive , stimulate , tap