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Prop (n.) A shell, used as a die. See Props.
Prop (v. t.) To support, or prevent from falling, by placing something under or against; as, to prop up a fence or an old building; (Fig.) to sustain; to maintain; as, to prop a declining state.
Prop (v.) That which sustains an incumbent weight; that on which anything rests or leans for support; a support; a stay; as, a prop for a building.