Twig
WordNet
noun
(1) A small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year
verb
(2) Branch out in a twiglike manner
"The lightning bolt twigged in several directions"
(3) Understand, usually after some initial difficulty
"She didn't know what her classmates were plotting but finally caught on"
WiktionaryText
Etymology 1
- (Noun) - from the Germanic root twi-, expressing (forking into) two-ness; cognate with Latin duo (two)
Verb
- To realise something; to 'catch on'.
- He hasn't 'twigged' that we're planning a surprise party for him.