n. dawn ; daybreak ; day
misc. the female character type in Beijing opera
throughout the whole night until the dawn;
通宵达旦
sit waiting for the dawn
坐以待旦
New Year's Day
元旦
一旦火鸡解冻，立刻移除鸡杂。
Once the turkey has defrosted, remove the giblets.
《柯林斯英汉双解大词典》
一旦我到了迈阿密就能找到工作。
Once I'm in Miami I can get a job.
火一旦熄灭，抢救队就会进去。
Once the fire has died out, the salvage team will move in.
"旦"是个多义词，它可以指旦（汉字）,旦（戏曲表演行当）。
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