Dictionary.net

(military) the act of pulling back (especially an orderly withdrawal of troops); "the pullback is expected to be over 25,000 troops"

a device (as a decorative loop of cord or fabric) for holding or drawing something back; "the draperies were drawn to the sides by pullbacks"

The iron hook fixed to a casement to pull it shut, or to hold it party open at a fixed point.

That which keeps back.

n. That which keeps back, or restrains from proceeding ; a drawback.