mourn /mɔːn $ mɔːrn/ BrE AmE verb [intransitive and transitive]
[ Language: Old English ; Origin: murnan ]
1 . to feel very sad and to miss someone after they have died SYN grieve for :
Hundreds of people gathered to mourn the slain president.
mourn for
They mourned for their children, killed in the war.
mourn sb’s death/loss/passing
She still mourns the death of her husband.
2 . to feel very sad because something no longer exists or is no longer as good as it used to be:
The old steam trains were much loved, and we all mourn their passing.