{i} something that provides a stimulus; stimulus, incentive, boost; flick of the finger
To strike with the nail of the finger, first placed against the ball of the thumb, and forced from that position with a sudden spring; to snap with the finger
If someone or something gives a fillip to an activity or person, they suddenly encourage or improve them. The news gave a fillip to the telecommunications sector = boost. something that improves a situation or adds excitement or interest to something = boost (From the sound of sharply moving your fingers against your thumb)