hit the sack 为什么解释为睡觉?

hit the sack 为什么解释为睡觉? I'm tired,let's hit the sack . I'm going to hit the sack,I'm exhausted.( it is time you hit the sack.这里的hit是过去式还是原形 retire,go to bed,hit the sack三者意思上的区别 sack out on the sack the quarterback bind the sack? get sb in the sack sack the defence什么意思 英语翻译Get boys into bed and before I knew it,the day was over!Time for me to hit the sack and do it all over again the next day! hit the hit the hit the hit the hit the hit the 第三题,为什么选hit me on the head不选hit me on my head