The term 'usurper' often carries a negative implication of illegitimacy and betrayal. The citizens did not trust the usurper, as they believed he stole the crown.
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Not Just Physical
'Usurper' isn't limited to physical takeovers; it can involve taking someone's role, authority, or credit. After the senior manager left, a colleague acted as a usurper, assuming his duties without approval.
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Historical Usage
The word is often used in historical contexts, relating to royal thrones and coups. The history books refer to him as a usurper of the ancient throne.