Definitions from Wiktionary ( )

▸ verb:  (transitive) With infinitive object: to be so presumptuous as (to do something) without proper authority or permission.
▸ verb:  (transitive, now rare) To perform, do (something) without authority; to lay claim to without permission.
▸ verb:  (transitive) To assume or suggest to be true (without proof); to take for granted, to suppose.
▸ verb:  (transitive) To take as a premise; to assume for the sake of argument.
▸ verb:  (intransitive) To be presumptuous; with on, upon, to take advantage (of), to take liberties (with).

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