1) Aggressively attempts 2) Assails 3) Attacks 4) Attacks vigorously 5) Attempts 6) Begins to pursue vigorously 7) Deals with 8) Engages in battle 9) Fights 10) Fights with 11) Goes after 12) Laces into 13) Lays into 14) Rips into 15) Sets upon 16) Starts in on 17) Starts to work on 18) Tackles 19) Tackles diligently