To bend one's head or body forward and downward. She stooped to pick up the fallen book.
To lower one's moral standards by doing something considered beneath one's dignity. He would never stoop to cheating, no matter how desperate he was.
To descend from a superior rank, dignity, or status. The king stooped to address the concerns of the common people.
Of a bird of prey, to swoop down on prey in a rapid dive. The peregrine falcon stooped at incredible speed to seize its target.