trippantIn heraldry, represented as walking or trotting, having usually one of the fore hoofs lifted and the other three on the ground: said of one of the beasts of chase, as the antelope or the hart. Also tripping.
Chambers's Twentieth Century Dictionary
adjTrippanttrip′ant (her.) represented as walking or trotting.
On a field tenney a buck, trippant, proper, unattired.
"Ulysses" by James Joyce
Robinson (of Yorkshire): Vert, a cheveron between three roebucks trippant or.
"Notes and Queries, Number 228, March 11, 1854" by Various