Etymology
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blooper (n.)

"blunder," 1943, apparently first in stage jargon, perhaps from the baseball slang meaning "a fly ball in a high arc missed by the fielder" (1937) or else from the earlier meaning "radio receiver that interferes with nearby sets" when a careless operator throws it into oscillation (1926), in which case it imitates the resulting sound (compare bloop).

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bloop (v.)

1926, a word from the early days of radio (see blooper). In baseball, "hit a ball in a high arc over the head of a fielder," by 1940. Related: Blooped; blooping. As a noun from 1931.

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