n.
Pronunciation: kwä- ' drü-p ə l, - ' dr ə -; ' kwä-dr ə -
Function: verb
Inflected Form: qua · dru · pled ; qua · dru · pling \ -p( ə -)li ŋ \
Etymology: Middle English (Sc), from Latin quadruplare, from quadruplus
Date: 14th century
transitive verb : to make four times as great or as many
intransitive verb : to become four times as great or as numerous