pullback

名词noun

1. 1The act or result of pulling back; a withdrawal.
2. 2(film) The act of drawing a camera back to broaden the visible scene.
3. 3dated or archaicSomething that holds back; a drawback; a hindrance.
4. 4(finance) A reduction in the price of a financial instrument after reaching a peak
5. 5(sports) An attacking pass from the wing into a position further from the attacking goal line.
6. 6historicalA device for making a woman's gown hang close and straight in front.
7. 7(differential geometry) The map between cotangent bundles of manifolds corresponding to a smooth map between smooth manifolds, which at each point is the dual map to the corresponding pushforward.
8. 8(category theory) The limit of a cospan: a Cartesian square or “pullback square”.