The phrase "hit sack" typically means to go to bed or to go to sleep. However, there are many antonyms to this phrase, which mean the opposite. Some antonyms for "hit sack" include stay up, pull an all-nighter, burn the midnight oil, or work late. These phrases indicate an action of staying awake or working through the night, which is contrary to going to bed. Other antonyms for "hit sack" include waking up, getting up, rising, or starting the day. These phrases imply that someone is getting up and starting their day rather than going to bed. Understanding antonyms for a phrase can help expand our vocabulary and improve our understanding of language.