The phrase "light into" is commonly used to mean to attack or criticize someone verbally. However, there are a variety of synonyms for this phrase that can be used to add variety to your writing or speech. Some alternatives to "light into" include berate, lambaste, reprimand, scold, admonish, chastise, censure, rebuke, upbraid, and excoriate. Each of these words carries a slightly different connotation, so consider selecting a synonym that best fits the tone and context of your communication. By expanding your vocabulary and using synonyms effectively, you can improve the impact and clarity of your language.