Definition of hoist one's flag in English:
(Of an admiral) take up command.
- In 1814 he briefly hoisted his flag at sea, commanding the naval escort for Louis XVIII's return to France from his English exile.
- Before their plans could come to fruition, though, they had a serious falling out, and on 2nd September 1966 he and his family took control of the tower on their own and hoisted their flag.
Definition of hoist one's flag in:
- US English dictionary