1. To launch an attack or assault on; begin hostilities with, as in warfare; SYN. assail.
2. To begin to injure.
3. To attack verbally, in speech or writing; SYN. round, assail, lash out, snipe, assault.
4. To take the initiative and go on the offensive; SYN. aggress.
5. To set to work upon; turn one's energies vigorously to a task.