[brim] n [ME brimme; akin to MHG brem edge] (13c) 1 a (1): an upper or outer margin: verge (2) archaic: the upper surface of a body of water b: the edge or rim of a hollow vessel, a natural depression, or a cavity
2: the projecting rim of a hat -- brim.less adj
[2]brim vb brimmed ; brim.ming vt (1611): to fill to the brim ~ vi 1: to be or become full often to overflowing
2: to reach or overflow a brim