Assert or confess openly.
with clause ‘he avowed that he had voted Labour in every election’
with object ‘he avowed his change of faith’
Middle English (in the senses ‘acknowledge, approve’ and ‘vouch for’): from Old French avouer ‘acknowledge’, from Latin advocare ‘summon in defence’ (see avouch).
I avow that this word is being posted late for the second day in a row.