What is having the right forefoot lifted, the others remaining on the ground, as if he were trotting; trippant; -- said of an animal, as a hart, buck, and the like, used as a bearing called?

tripping — (Her.) Having the right forefoot lifted, the others remaining on the ground, as if he were trotting; trippant; -- said of an animal, as a hart, buck, and the like, used as a bearing. (Webster's 1913.)

Sources