hit the hay

題目：

hit the hay
The cowboy was tired after a day of cattle herding.He said,"I am going to hit the hay .See you in the morning."
請大家幫我解釋下hit the hay

解答：

hit the hay
Verb
1.go to bed in order to sleep; "I usually turn in at midnight"; "He turns out at the crack of dawn"
(synonym) go to bed,turn in,bed,crawl in,kip down,hit the sack,sack out,go to sleep,retire
(hyponym) bed down,bunk down
就是上牀睡覺的意思