As a noun: jokes, humorous situations, or devices used to prevent speech; as a verb: to retch, choke, or restrain someone's ability to speak.
Possibly imitative of the choking sound, first recorded in the 15th century. The 'joke' sense developed in American English around 1863, likely from theatrical 'gag lines' that were improvised or inserted for comic effect.
The evolution from choking sound to comedy gold reveals humor's power to help us 'swallow' difficult situations. Theater gags were originally unscripted moments that audiences found unexpectedly delightful, showing how spontaneity often creates the best comedy.
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