旦

通宵达旦

tōng xiāo dá dàn

overnight until daybreak (idiom); all night long

闺门旦

guī mén dàn

young unmarried lady role in Chinese opera

双旦

shuāng dàn

Christmas and New Year's Day

震旦

zhèn dàn

ancient Indian name for China

震旦纪

zhèn dàn jì

Sinian (c. 800-542 million years ago), late phase of pre-Cambrian geological era

震旦鸦雀

zhèn dàn yā què

(bird species of China) reed parrotbill (Paradoxornis heudei)

魔王撒旦

mó wáng sā dàn

Satan, Devil king

一旦

yī dàn

in case (sth happens)

乾旦

qián dàn

male actor playing the female role (Chinese opera)

信誓旦旦

xìn shì dàn dàn

to make a solemn vow

元旦

yuán dàn

New Year's Day

刀马旦

dāo mǎ dàn

female warrior role in Chinese opera