The feeling of being trapped within a group that is hostile to you.

It can be used as a verb or adverb.

In reference to a stage of a medieval siege, where the attackers may seize the outer layer of defenses, but not the inner keep or citadel. At this point the attackers may themselves become besieged within the walls by a relieving army, with the original inhabitants of the fortress still stuck inside.
"Many Americans feel Citadelled by political parties that no longer represent their interests."
by Bobby_Boy July 20, 2022
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