n. [ OE. on on + slaught, slaht, slaughter. See Slaughter. ] 1. An attack; an onset; esp., a furious or murderous attack or assault. [ 1913 Webster ]
By storm and onslaught to proceed. Hudibras. [ 1913 Webster ]
2. A bloody fray or battle. [ Scot. ] Jamieson. [ 1913 Webster ]