Twig

style. Prime twig , in good order and high spirits.
to comprehend, as, “Do you twig ?” Also, “Hop the twig ,” to decamp.
To twig: To observe. Twig the cull, he is peery; observe the fellow, he is watching us. Also to disengage, snap asunder, or break off. To twig the darbies; to knock off the irons.