(Chinese history) an era during the Tang dynasty, from 827 through 835 CE / (Chinese history) an era during the Five Dynasties and Ten Kingdoms period, from 929 through 935 CE

to sink; to go to the bottom / (of the sun) to set / to be immersed / to feel downcast, dejected, depressed / to droop

solid

遅刻: lateness, late coming / 治国: government