from wordorigins.org:Originally Posted by theveed
The popular explanation of the origin of tip, meaning a gratuity, is that it is an acronym meaning "to insure promptness." This is incorrect.
Tip is underworld cant meaning to pass on, to hand to, especially to pass on a small sum of money. It dates to at least 1610. The verb meaning to give a gratuity dates to about a century later, and the noun dates to at least 1755. And as we've seen many times in these pages, there are no pre-20th century acronymic word origins.
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