1.
flag of rebellion, revolt
Literally a flag raised in rebellion. Almost exclusively used in the fixed expression 反旗を翻す (to raise the flag of rebellion), meaning to rebel or revolt against authority.
Common collocations
Usage
Almost always appears in the set expression 反旗を翻す. While the literal meaning involves warfare, it is commonly used figuratively for any act of open defiance against authority — a politician breaking from their party, employees challenging management, or anyone publicly opposing the established order.