lash back (at someone or something)
To retaliate against someone or something with an intense physical or verbal attack. The protesters lashed back at the police with a volley of bricks and rocks. The senator lashed back at critics of his tax-reform proposal during a press conference this afternoon.
lash back (at someone or something)
to strike or fight back against someone or something—physically or verbally. Randy lashed back at his attackers and drove them away. If you threaten Fred, he'll lash back.