to render null and void.-to increase the action or violence of; to heighten excitement in; to intensify; to stimulate.-to excite anger or displeasure in; to provoke; to tease; to exasperate; to annoy; to vex; as, the insolence of a tyrant irritates his subjects.-to produce irritation in; to stimulate; to cause to contract. see irritation, n., 2.-to make morbidly excitable, or oversensitive; to fret; as, the skin is irritated by friction; to irritate a wound by a coarse bandage.-excited; heightened.