noun An object placed against or under another, to support it; anything that supports.
They stuck a block of wood under it as a prop.
noun The player on either side of the hooker in a scrum.
noun Any of the seashells in the game of props.
verb To support or shore up something.
Try using a phone book to prop up the table where the foot is missing.
verb To play rugby in the prop position.
verb To position the feet of (a person) while sitting, lying down, or reclining so that the knees are elevated at a higher level.
verb To stop suddenly or unexpectedly; derived from the situation where a horse might suddenly halt of its own accord, digging its front hooves into the ground to brace itself from forward movement, potentially unseating its rider.