Etymology

zonk

Z10O1N1K5

Today it means: An unfavorable card or token, or undesirable or worthless item used as a prize in a contest or game show (such as Let's Make a Deal). Full definition →

First used 1950
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The story

First attested in c. 1950. Unknown origin, likely imitative, of echoic origin.

First known use, by meaning

  • from 1950 To hit hard.
  • from 1968 To make (someone) sleepy or delirious, to put into a stupor.

Etymology from Wiktionary, CC BY-SA 4.0.