Twig, v. t. [Gael. tuig, or Ir. tuigim I understand.]
1. To understand the meaning of; to comprehend; as, do you twig me? Marryat.
2. To observe slyly; also, to perceive; to discover. “Now twig him; now mind him.” Foote.
As if he were looking right into your eyes and twigged something there which you had half a mind to conceal. Hawthorne.