intransitive. To make a formal or emphatic declaration or statement. Now rare or merged in sense 6a.

To make assertion, to assert, v. (The latter was apparently not yet in use.)

To assert as a fact; to state positively, affirm. absol. quasi- intransitive.

intransitive. To bear witness, ‘testify’, make a solemn appeal or protest. Obsolete.

To affirm solemnly, assert emphatically, declare positively, avouch, aver. with subordinate clause.

intransitive for reflexive. To assert on one's own responsibility that. (Cf. engage, v. 6.)

intransitive. To make an assertion. Obsolete.

intransitive. To present oneself in a particular (usually assumed) character, esp. for effect or to impress others; to attitudinize; to set…

slang. to take one's dick: to make a declaration, to take an oath. Obsolete.

intransitive. colloquial. To claim or profess to be something. Cf. to set up 40 at set, v.1 phrasal verbs 2. Obsolete.