Verb

(es)

To declare freely and openly; to assert.

* Shakespeare

if this which he avouches does appear

* Spenser

Such antiquities could have been avouched for the Irish.

To acknowledge deliberately; to admit; to confess; to sanction.

* Bible, Deuteronomy xxvi. 17

Thou hast avouched the Lord this day to be thy God.

To confirm or verify, to affirm the validity of.

* Milman

We might be disposed to question its authenticity, it if were not avouched by the full evidence.

To appeal to; to cite or claim as authority.

* Edward Coke

They avouch many successions of authorities.

Verb

(en verb)

To hold up a claim emphatically.

(I am defending her; see a similar example in the context below for comparison.)

*

, title=(The Celebrity), chapter=5 , passage=But Miss Thorn relieved the situation by laughing aloud,

* {{quote-magazine, date=2013-06-22, volume=407, issue=8841, page=70, magazine=(The Economist)

, title= Engineers of a different kind , passage=Private-equity nabobs bristle at being dubbed mere financiers. Piling debt onto companies’ balance-sheets is only a small part of what leveraged buy-outs are about, they insist . Improving the workings of the businesses they take over is just as core to their calling, if not more so. Much of their pleading is public-relations bluster.}}

To demand continually that something happen or be done.

To stand (on); to rest (upon); to lean (upon).

* 1709 , Venturus Mandey, Synopsis Mathematica Universalis

Angles likewise which insist on the Diameter, are all Right Angles.