Main Entry: ¹qua·dru·ple

Pronunciation: \kwä-ˈdrü-pəl, -ˈdrə-; ˈkwä-drə-\

Function: verb

Inflected Form(s): qua·dru·pled; qua·dru·pling \-p(ə-)liŋ\

Etymology: Middle English (Scots), from Latin quadruplare, from quadruplus

Date: 14th century

transitive verb : to make four times as great or as manyintransitive verb : to become four times as great or as numerous