"Get off the hook" is an idiom that means to avoid blame or punishment for something. The antonyms for this expression could be "held accountable," "punished," or "confronted." These terms describe the opposite of avoiding punishment or blame, instead suggesting that an individual will face the consequences of their actions. Additionally, "held responsible," "accountable for," and "answerable to" are other antonyms that can be used to convey the idea of not being let off easily. Therefore, using these antonyms in place of "get off the hook" can provide a more accurate and descriptive portrayal of the situation at hand.