noun
mourning flag; flag at half-mast
A flag flown to express mourning, often draped in black or flown at half-mast.
国葬の日、全国の官公庁で弔旗が掲げられた。
On the day of the state funeral, mourning flags were flown at government offices nationwide.
弔旗を半旗にして哀悼の意を表した。
They flew the flag at half-mast to express their condolences.