the.com/prop

An object that pretends to matter but mostly exists to be put down later.

means An object used to support something, demonstrate a point, or give an actor something to hold while pretending to be someone else — and, in slang, a nod of respect given where it's due.

from Shortened from 'property,' as theater folk called the movable items used onstage — a sword, a teacup, a skull to brood over. The clipping dates to 19th-century stage slang. The 'proper respect' sense ('give props') is unrelated in feeling but tangled in root: it likely comes from 'proper recognition' shortened the same blunt way English loves to shorten things.

stage origin
short for property, theater jargon since the 1800s
aviation sense
propeller got clipped the same lazy way
slang use
to prop someone is to give deserved respect
continuity nightmare
same prop must match shot after shot
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