to go to bed
to go to sleep
to retire for the evening and go to sleep.
I am really tired after all that movie. I am going to hit the sack.
After the long day out, we were so tired and ready to hit the sack as soon as we reached home.
I haven’t hit the sack in nearly two days, because of my new project.
He wanted to hit the sack and did not go to party.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.