"Lashing out at" is a commonly used phrase that refers to expressing anger or frustration towards someone or something. However, it's always good to have a variety of ways to express our emotions, so here are some synonyms for the phrase: attacking, berating, criticizing, rebuking, scolding, lambasting, castigating, upbraiding, reproaching, censuring. These words can be used in various contexts, but they all convey a similar sentiment of expressing anger or frustration. It's important to remember to use our words carefully and kindly, even in times of frustration, to maintain healthy communication and relationships with those around us.