Definitionen
1.VerbOf an animal, to escape into a burrow, hole, etc. when being hunted."The fox escaped from the hounds by going to ground."
2.VerbTo hide from public view or sequester oneself, especially when authorities, members of the news media, or others are looking for one.
3.VerbTo fall to the ground, lose one's footing, come off one's feet, whether by design, accident, or foul
4.Verb(of the ball) to touch the ground; to be dropped