Per Dal, fromстыка́ть(stykátʹ,“toconnect, tojoin”) +‎-ка(-ka); presumably the sense development was "joining" → "meeting" → "skirmishing".

• IPA^(key): [ˈstɨt͡ɕkə]

сты́чка• (stýčka) f inan (genitiveсты́чки,nominative pluralсты́чки,genitive pluralсты́чек)

1. skirmish (brief battle between small groups)

• Dal, Vladimir (1880–1882), “стычка”, inТолковый Словарь живаго великорускаго языка [Explanatory Dictionary of the Living Great Russian Language] (in Russian), 2nd edition, Publication of the bookseller-typographerWolf, M. O.

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