Etymology
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backstroke (n.)

also back-stroke, 1670s, "counter-punch;" see back (adv.) + stroke (n.). From 1876 as a swimming stroke, from back (n.).

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Definitions of backstroke
1
backstroke (v.)
swim on one's back;
2
backstroke (n.)
a swimming stroke that resembles the crawl except the swimmer lies on his or her back;
From wordnet.princeton.edu