* The news of her promotion gave her career a much-needed fillip. (Meaning: The news boosted her career.)
* The comedian's witty remarks provided a fillip to the otherwise dull evening. (Meaning: The comedian's jokes made the evening more interesting.)
* He gave the ball a fillip with his finger, sending it soaring through the air. (Meaning: He flicked the ball with his finger.)
* The company's new marketing campaign was intended to give their sales figures a fillip. (Meaning: The campaign was meant to increase sales.)
As you can see, "fillip" can be used to describe a boost, a stimulus, or a quick flick.