TRIG Meaning of TRIG in English 1. n. colloq. trigonometry. Etymology: abbr. 2. adj. & v. archaic or dial. --adj. trim or spruce. --v.tr. (trigged, trigging) make trim; smarten. Etymology: ME, trusty, f. ON tryggr, rel. to TRUE Oxford English vocab. Оксфордский английский словарь. 2012