Other forms: lashed out; lashing out; lashes out
When you lash out at someone, you express your anger by saying or writing furious words about them. A writer whose book has been harshly criticized might lash out at the critic.
A politician might lash out at her opponent in a speech, and a journalist might lash out at polluting companies by writing an opinion piece for a newspaper. You can also lash out in a physical way, by kicking or hitting someone in anger — this is the phrase's original meaning, from the verb lash, "to whip."