What is the meaning of twig?

noun

• A small branch or division of a branch (especially a terminal division); usually applied to branches of the current or preceding year.
  • synonyms: branchlet, sprig

verb

• Branch out in a twiglike manner.
  • usage: "The lightning bolt twigged in several directions"
• Understand, usually after some initial difficulty.
  • usage: "She didn't know what her classmates were plotting but finally caught on"
  • synonyms: catch on, get wise, get onto, tumble, latch on, cotton on, get it