noun

• (rugby) The player on either side of the hooker in a scrum.

verb

• (transitive, sometimes figurative) To support or shore up something.
  "Try using a phone book to prop up the table where the foot is missing."
• (intransitive) To play rugby in the prop position.
• (transitive, usually with "up" - see prop up) To position the feet of (a person) while sitting, lying down, or reclining so that the knees are elevated at a higher level.
• (transitive, UK, slang, obsolete) To knock (a person) down.
  "We used to go out into the roads (highway robbery) between races, and if we met an ‘old bloke’ (man) we ‘propped him’ (knocked him down), and robbed him."

noun

• (theater, film) An item placed on a stage or set to create a scene or scenario in which actors perform.
  "They used the trophy as a prop in the movie."

noun

• (astronautics) propellant (“rocket fuel”)