[roach] n, pl roach also roach.es [ME roche, fr. MF] (13c) 1: a silver-green European freshwater cyprinid fish (Rutilus rutilus); also: any of various related fishes (as some shiners)
2: any of several American freshwater sunfishes (family Centrarchidae)
[2]roach n [origin unknown] (1794) 1: a curved cut in the edge of a sail to prevent chafing or to secure a better fit
2: a roll of hair brushed straight back from the forehead or side of the head [3]roach vt (1818) 1: to cut (as a horse's mane) so that the remainder stands upright
2: to cause to arch; specif: to brush (the hair) in a roach--often used with up [4]roach n [by shortening] (ca. 1848) 1: cockroach
2: the butt of a marijuana cigarette