shillelagh /ʃəˈleɪli/ noun2 •(Ireland) A wooden (traditionally blackthorn (sloe) wood) club ending with a large knob.It beats all your guns and your rifles, / For it goes off whene'er you desire, / And it's sure to hit just what it aims at, / For shillelaghs they never miss fire. — 1864 •Any cudgel, whether or not of Irish origin. formsshillelaghs