From Longman Dictionary of Contemporary Englishstoop to something phrasal verbDOto do something bad or morally wrong, which you do not normally dostoop to doing something I didn’t expect you to stoop to lying.stoop to somebody’s/that level Don’t stoop to her level. → stoop→ See Verb table
Examples from the Corpus
stoop to • This from a man who would stoop to any level, psychological gamesmanship included, to retain the crown jewels.• With my direct pipeline into Rainbow's thoughts blocked off, I must stoop to guesswork.stoop to doing something• I am shocked that the magazine would stoop to publishing nude pictures of the couple.• Automatically he stooped to pick it up.• Blindly he stooped to pick up the towels.• I no longer had to stoop to wash my hands in public restrooms.• One of her crutches falls in front of the man; she has to painfully stoop to recover it.• She stoops to gather stones en route.• The noise was deafening as we reached the little courtyard and stooped to enter the main room of the temple.• This from a man who would stoop to any level, psychological gamesmanship included, to retain the crown jewels.• With my direct pipeline into Rainbow's thoughts blocked off, I must stoop to guesswork. 