noun
a thick stick of blackthorn or oak used in Ireland, typically as a weapon
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The shillelagh is a traditional Irish walking stick made from blackthorn wood.
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He swung his shillelagh at the intruder, ready to defend his home.
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I can't believe he brought a shillelagh to the party, what a weirdo.
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Her words were like a shillelagh, striking him with their harshness.