auld lang syne /ˌoʊldˌlæŋˈzaɪn/ noun Learner's definition of AULD LANG SYNE
[singular]
: the good old times美好的昔日；过去的美好时光 ◊ Auld lang syne comes from the name of a Scottish song that is traditionally sung at midnight on New Year's Eve.这一短语源自一首苏格兰民谣《友谊地久天长》，人们通常在除夕夜唱这首歌曲。