Merriam-Webster's Collegiate® Dictionary, 11th Edition
TWIG
I. noun
Etymology: Middle English twigge, from Old English; akin to Old High German zwīg twig, Old English twā two Date: before 12th century a small shoot or branch usually without its leaves, a minute branch of a nerve or artery, twigged adjective twiggy adjective
II. verb (twigged; twigging)
Etymology: perhaps from Irish & Scottish Gaelic tuig- understand
Date: 1764
transitive verb notice , observe , to understand the meaning of ; comprehend , intransitive verb to gain a grasp ; understand ,
III. noun
Etymology: origin unknown
Date: circa 1811
fashion , style