Dunk

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early 20th century: from Pennsylvanian German dunke ‘dip’, from German tunken ‘dip or plunge’.

wiktionary

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From Pennsylvania German dunke, from Middle High German dunken, from Old High German dunkōn(“to dip, submerge, dunk”), from Proto-West Germanic *þunkōn(“to make wet”), possibly from Proto-Germanic *þunkōną, from Proto-Indo-European *teng-(“to moisten, wet”).

Cognate with German tunken(“to dunk”), Latin tingō(“to wet, moisten”), Ancient Greek τέγγω(téngō, “to wet, moisten”). Related to taint, tincture, tint.

etymonline

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dunk (v.)

1919, "to dip (something) into a beverage or other liquid," American English, from Pennsylvania German dunke "to dip," from Middle High German dunken, from Old High German dunkon, thunkon "to soak," from PIE root *teng- "to soak" (see tincture). The basketball sense "jump up and push (the ball) down through the basket" is recorded by 1935 as a verb (implied in dunking), 1967 as a noun (earlier dunk shot, 1950). Related: Dunked.