Crossword clue: to take plunder or prey; to commit waste; as, the troops depredated on the country.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
To subject to plunder and pillage; to despoil; to lay waste; to prey upon. It makes the substance of the body . . . less