sack out英 [sæk aʊt]美 [sæk aʊt]〈美口〉上床睡觉英英释义verbprepare for sleepI usually turn in at midnightHe goes to bed at the crack of dawnSynonym:go to bedturn inbedcrawl inkip downhit the hayhit the sackgo to sleepretire双语例句