n. The act or result of pulling back; a withdrawaln. That which holds back, or causes to recede; a drawback; a hindrance.n. The iron hook fixed to a casement to pull it shut, or to hold it partly open at a fixed point.n. A reduction in the price of a financial instrument after reaching a peakn. Given a pair of morphisms and with a common codomain, Z, their pullback is a pair of morphisms and as well as their common domain, P, such that the equation is satisfied, and for which there is the universal property that for any other object Q for which there are also morphisms , ; there is a unique morphism such that and .