Rare or specialized term meaning to act as a fungus; to function or operate in a particular role (often used in legal or commercial contexts).
Possibly from fungus or from Latin fungi (to perform, execute). This is an extremely rare word with unclear etymology, possibly a back-formation from fungus or borrowed from legal/financial terminology. It may relate to 'fungible' (exchangeable), though that connection is speculative.
The word 'funge' is so rare that even lexicographers aren't entirely certain of its origins or whether it's actually used in contemporary English, which shows that the Oxford English Dictionary contains thousands of ghost words—documented once or twice in historical texts but never embraced by speakers.
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