lash into (someone or an animal)
to attack someone or an animal—physically or verbally. Dad lashed into my brother, who had smashed up the car again. Walter lashed into the cat for tearing the upholstery.
lash into something
to begin to eat something with vigor. Mary lashed into the huge ice cream sundae, and ate almost the whole thing. The workers lashed into their lunches and did not say a word until they had finished.