Noah Webster
Avouch
AVOUCH', verb transitive [Latin voco, advoco. See Voice.]
1. To affirm; to declare or assert with positiveness.
2. To produce or call in; to affirm in favor of, maintain or support.
Such antiquities could be avouched for the Irish.
3. To maintain, vindicate or justify.
AVOUCH', noun Evidence; testimony; declaration. [Little Used.]