A boat that displays a flag, particularly a naval vessel that carries the flag of a commanding officer or admiral.
Compound of 'flag' (from Old Norse 'flag' meaning to wave) and 'boat' (Old English 'bāt'); naval terminology used from the 17th century onward.
A flagboat wasn't just any ship—it was the one where the admiral stood, so in battle, if you wanted to break enemy morale, you targeted their flagboat first, making 'become the flagboat' one of the most dangerous military positions.
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