sack out on the

sack out on the nothing comes out of the sack but what was in it翻译一下 get sb in the sack get the sack的典故 hit the sack 为什么解释为睡觉? get out there on the be on the look out go out on the road you may know by a handful the whole sack. I'm tired,let's hit the sack . he got the sack because of his laziness.是什么意思? I'm going to hit the sack,I'm exhausted.(