the.com/dummy

The insult you throw before checking if you're the one who's wrong.

means A dumb or stupid person, or something that's a fake stand-in for the real thing.

from From 'dumb,' which originally meant mute, unable to speak — the '-my' ending turned it into a noun for someone who couldn't talk. By the 1800s it had widened to mean a stupid person, and separately came to name mute stand-ins: a ventriloquist's dummy, a tailor's dummy, a crash-test dummy — all things shaped like a person but with nothing to say for themselves.

crash test origin
named after literal test crash dummies, 1950s
etymology
from dumb, meaning mute, not stupid
pacifier usage
british english for what americans call pacifier
card games
bridge term for the exposed, silent hand
the.com · every word