What is Avow?

Legal Definition
In pleading. To acknowledge and justify an act done. To make an avowry. For example, when replevin ls brought for a thing distrained, and the party taking claims that he had a right to make the distress, he is said to avow. Newell Mill Co., v. Muxlow, 115 N. Y. 170, 21 N. E. 1048.
-- Black's Law Dictionary
Legal Definition
To admit an act and to justify it.
-- Ballentine's Law Dictionary