nationalmourning national mourning. mourn [mɔːn] Mourning is mourning, not morning Tomb Sweeping Day Tomb Sweeping Day succumb [səˈkʌm] Unable to resist disease/temptation succumb to Fixed collocation Those who succumb

practical English, just look at YY English.

Today is a national day of mourning for those lost to the coronavirus.

national mourning National mourning. mourn [mɔːn] Mourning

Note that it is mourning, not morning

Tomb Sweeping Day Tomb Sweeping Day

succumb [səˈkʌm] Unable to resist disease/temptation (here refers to death due to the epidemic)

succumb to Fixed collocation

Those who succumbed to the novel coronavirus.

martyr Martyrs [ˈmɑːtə(r)]

half-mast flags at half-mast

lowered to half-mast, or fly at half-mast, flags lowered to half-mast

pay tribute to those heroes.