To support or prevent from falling by placing something under or against; as, to prop a fence or an old building.

To support by standing under or against. Till the bright mountains prop th’ incumbent sky.

To support; to sustain; in a general sense; as, to prop a declining state. I prop myself upon the few supports that are left me.

That which sustains an incumbent weight; that on which any thing rests for support; a support; a stay; as a prop for vines; a prop for an old building. An affectionate child is the prop of declining age.