But \But\, n. [See 1st {But}.] 1. A limit; a boundary. [1913 Webster] 2. The end; esp. the larger or thicker end, or the blunt, in distinction from the sharp, end. Now disused in this sense, being replaced by {butt}[2]. See 1st {Butt}. [1913 Webster +PJC] {But end}, the larger or thicker end; as, the but end of a log; the but end of a musket. See {Butt}, n. [1913 Webster]