v. Obs. [f. BE- 2 + TRACK v.] trans. To trace or track carefully. Hence Betracker, spec. one who searches cloth for faults.
 
1578.  in Stow, Survey (Strype, 1754), II. V. xx. 403/2. If the owner thinketh his baye to be better, he doth appeal to another company called Betrackers.