Hit the sack and Sit out

Hit the sack verb - Prepare for sleep.

Sit out and hit the sack are semantically related. In some cases you can use "Sit out" instead a verb phrase "Hit the sack".

Sit out verb - Endure to the end.

Hit the sack and sit out are semantically related. Sometimes you can use "Hit the sack" instead a verb "Sit out".