"twig" in the noun sense
1. branchlet, twig, sprig
a small branch or division of a branch (especially a terminal division usually applied to branches of the current or preceding year
"twig" in the verb sense
branch out in a twiglike manner
"The lightning bolt twigged in several directions"
2. catch on, get wise, get onto, tumble, latch on, cotton on, twig, get it
understand, usually after some initial difficulty
"She didn't know what her classmates were plotting but finally caught on"
Source: WordNet® (An amazing lexical database of English)
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