Hit the sack and Lie down

Hit the sack verb - Prepare for sleep.

Lie down and hit the sack are semantically related in go to bed topic. In some cases you can use "Lie down" instead a verb phrase "Hit the sack".

Lie down verb - Assume a reclining position.

Hit the sack and lie down are semantically related in go to bed topic. You can use "Hit the sack" instead a verb "Lie down".