From Longman Dictionary of Contemporary Englishnot a pennynot a pennyMONEYused to emphasize that someone has no money or that something did not cost any money I haven’t got a penny on me. It didn’t cost me a penny. He died without a penny to his name. → penny
Examples from the Corpus
not a penny• It wouldn't cost him a penny to go to college here.• The best collection I ever knew had cost its owner not a penny.• We will carry you to San Francisco on the train, not a penny of expense to you. 