Other forms: stooped; stooping; stoops
Stoop means to lean your head and torso forward and down. If you're six feet tall and you tour a historical building, you'll have to stoop to get through the low doorways.
Stoop comes from the same root as steep. You can stoop to clear a doorway, or stoop metaphorically, by lowering your morals. If you slouch and droop, you are stooping. When owls quickly descend on their prey, that's also called stooping. Last but not least, a stoop refers to a small porch or the stairs leading up to a front entrance of a house, but that meaning is from the Dutch word stoep, "flight of steps, doorstep, or threshold."