tal·ly·ho 
(tăl′ē-hō)
(tăl′ē-hō)interj.
Used in fox-hunting to urge the hounds on when a fox is sighted.
v. tal·ly·hoed, tal·ly·ho·ing, tal·ly·hos
v.tr.
To urge (hounds) on with such a hunting cry.
v.intr.
To shout "tallyho" as a hunting cry.
n. pl. tal·ly·hos
1. The cry of "tallyho."
2. A fast coach drawn by four horses.
[Probably alteration of French taïaut, from Old French thialau, taho.]