avuncular (adj.)

"of or pertaining to an uncle," 1789, from Latin avunculus "maternal uncle," diminutive of avus (see uncle) + -ar. Used humorously for "of a pawnbroker" (uncle was slang for "pawnbroker" from c. 1600 through 19c.).
Being in genteel society, we would not, of course, hint that any one of our readers can remember so very low and humiliating a thing as the first visit to "my Uncle"--the first pawnbroker. We have been assured though, by those whose necesssities have sometimes compelled them to resort, for assistance, to their avuncular relation, that the first visit--the primary pawning--can never be forgotten. ["North American Miscellany," New York, 1852]

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