quadruple - Wiktionary, the free dictionary quadruple (third-person singular simple present quadruples, present participle quadrupling, simple past and past participle quadrupled) (transitive) To multiply by four Quadrupling four gives sixteen Our profits quadrupled when we made the improvements
quadruple - WordReference. com Dictionary of English to make or become four times as great: [no object] The number of ESL students has quadrupled [~ + object] This will quadruple your profits See -quad-, -plic-