Swimming

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Old English swimman (verb), of Germanic origin; related to Dutch zwemmen and German schwimmen .

wiktionary

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From Middle English swymmynge. Equivalent to swim(“to move through water”, verb) +‎ -ing(suffix forming gerunds).

From swim(“to be dizzy”, verb) +‎ -ing(suffix forming gerunds).

See the etymology of the corresponding lemma form.

etymonline

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swimming (n.)

late 14c., "act of propelling the body through water," verbal noun from swim (v.). Swimming hole is from 1855, American English; swimming pool is from 1881.