arrogar

A formal, mostly legal/political verb meaning to arrogate or claim for oneself, especially a right, power, or authority one isn't entitled to — almost always used reflexively: arrogarse el derecho/la facultad de hacer algo. It carries a critical tone, implying the claim is overreaching.

• Se arrogó el derecho de decidir por todos. — He arrogated to himself the right to decide for everyone.
• El comité se arrogó facultades que no le correspondían. — The committee claimed powers that weren't rightfully its own.
• Nadie puede arrogarse la representación de todo el pueblo. — No one can claim to represent the whole population on their own authority.

Using arrogar without the reflexive pronoun and without a specific right/power as its object — the verb almost always appears as arrogarse + [derecho/poder/facultad], not as a general synonym for "to claim" in the everyday sense.