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flag flown at half-mast; mourning flag

Explanation

〔弔旗〕

1. flag flown at half-mast; mourning flag
A national flag hoisted by being lowered by its width from the summit of the flagpole to mourn the death of someone.

2. mourning flag
A flag with a piece of black cloth attached on it or black lines drawn on it as an expression of mourning.