Patronize

wiktionary

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From patron +‎ -ize(verb ending); or from Old French patroniser, from Medieval Latin patronisāre(“to lead a galley as patron”). [1]

etymonline

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patronize (v.)

1580s, "to act as a patron towards, favor, assist," from patron + -ize, or from Old French patroniser. Meaning "treat in a condescending way" is attested by 1797; the sense of "give regular business to" is from 1801. Related: Patronized; patronizing; patronization.