to bend the body forward and downward, sometimes simultaneously bending the knees
She stooped to pick up the child
to stand or walk with a temporary or habitual forward inclination of the head, body, or shoulders
He was getting old and beginning to stoop
to condescend
The gods stoop to intervene in the affairs of men
(usu in negative contexts ) to lower oneself morally
I hope I would not stoop to spying on a friend
said of a bird: to fly or dive down swiftly, usu to attack prey
to bend (one's head or shoulders) forward and downward
He had to stoop his head to catch her stifled whisper — Edith Wharton
[Old English stūpian]