Tradition
St. Augustine
The Enarrations, or Expositions, on the Psalms
Psalm 109 › Section 13
13. But as even orphans may, without one to help them, and without a guardian, nevertheless increase amid trouble and want, and preserve their race by descent; he next says, “Let his posterity be destroyed; and in the next generation let his name be clean put out”: that is, let what has been generated by him generate no more, and quickly pass away.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)