From The Collaborative International Dictionary of English v.0.48:
Squat \Squat\, n. 1. The posture of one that sits on his heels or hams, or close to the ground. [1913 Webster]
2. A sudden or crushing fall. [Obs.] --Herbert. [1913 Webster]
3. (Mining) (a) A small vein of ore. (b) A mineral consisting of tin ore and spar. --Halliwell. --Woodward. [1913 Webster]
Squat snipe (Zool.), the jacksnipe; -- called also squatter. [Local, U.S.] [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Squatter \Squat"ter\ (-t[~e]r), n. 1. One who squats; specifically, one who settles unlawfully upon land without a title. In the United States and Australia the term is sometimes applied also to a person who settles lawfully upon government land under legal permission and restrictions, before acquiring title. [1913 Webster]
In such a tract, squatters and trespassers were tolerated to an extent now unknown. --Macaulay. [1913 Webster]
2. (Zool.) See Squat snipe, under Squat. [1913 Webster]
Squatter sovereignty, the right claimed by the squatters, or actual residents, of a Territory of the United States to make their own laws. [Local, U.S.] --Bartlett. [1913 Webster]