31 Moby Thesaurus words for "be off": beat it, begone, clear out, flake off, get, get going, get lost, get off, get out, git, go forth, hit the road, issue, issue forth, make yourself scarce, outset, outstart, put forth, sally, sally forth, scram, set forth, set forward, set off, set out, shove off, start, start off, start out, strike out, vamoose

Source: Moby Thesaurus II by Grady Ward, 1.0