Grassâtor, pen. prod. grassatôris, m. g. Cic.He that robbeth and sleaeth by the high way. Also an extortioner.
Lewis and Short: Latin dictionary
grassātor, ōris, m. [id.]. I.A vagabond, idler: poëticae artis honos non erat. Si qui in ea re studebat, aut sese ad convivia applicabat, grassator vocabatur, Cato ap. Gell. 11, 2, 5.—II.A disorderly person, one who goes rioting about (esp. at night, whether for fun and enjoyment or for robbery), a rioter, a waylayer, street-robber, footpad: hoc modo viator quoque bene vestitus causa grassatori fuisse dicetur, cur ab eo spoliaretur, Cic. Fat. 15, 34: grassatorum plurimi palam se ferebant succincti ferro, Suet. Aug. 32: grassatores et sicarii, id. Caes. 72: nocturni grassatoris insidiosa violentia, Gell. 20, 1, 8; Quint. 12, 1, 38: ferro subitus grassator agit rem, Juv. 3, 305.