Definition of threadbare 1a : having the nap worn off so that the thread shows : shabby threadbare clothes. b : wearing threadbare clothing : very poor took in threadbare relatives— Russell Baker. c : barely adequate because of cheapness or shabbiness a threadbare production.
1 slang : intoxicating liquor : drink. 2 : a habitual heavy drinker : drunkard. lush. verb. lushed; lushing; lushes.