"Take a chunk out of" is an idiom that describes an action of removing a considerable amount from something, typically as a result of some force or pressure. Some synonyms for this phrase could be "removed a large portion of," "made a significant impact on," "subtracted a substantial amount from," "carved out a sizable piece of," "cut deeply into," or "eroded a significant amount of." These phrases can be used interchangeably depending on the context or the severity of the action, but they all convey the same concept of a significant reduction or damage to something. Overall, varying your language can add depth and nuance to your writing or speech.