-s- +‎-in;-s- probably originates from two sources:^[1]

• re-extracted from-in derivatives for-aista verbs, such aslaukaisin <laukaista
• by analogy with-ise- nouns

-sin

1. Forms certain nouns, particularly those describing tools or implements.

• -isin

CompareSouthern OhlonehuSun(“further on”) fromhuSu(“to move away”) +‎-n(nominalizing suffix).

-sin

1. forms the future tense of verbs

   ‎juwwa(“towait”) + ‎-sin → ‎juwwasin(“will wait”)

• María de los Angeles Colós, José Guzman, and John Peabody Harrington (1930s),Chochenyo Field Notes (Survey of California and Other Indian Languages)‎^[1], Unpublished

Inherited fromOttoman Turkishـسڭ(-sin), fromOld Anatolian Turkish[script needed](-sen, -sin, -san, -sın), ultimately fromProto-Turkic*sen. Cognate withAzerbaijani-sən. Compare-im(“first-person singular suffix”) fromProto-Common Turkic*ben (seeben(“I”)).

• IPA^(key): /sin/

-sin

1. Suffix of verb "to be" for subject "you" (informal).

   Gençsin. ―You are young.

FromProto-Turkic*-zün(“third-person singular imperative suffix”). Cognate withAzerbaijani-sin,Uzbek-sin.

• IPA^(key): /ˈsin/

-sin

1. Suffix forming third-person singular imperative.

• Finnish terms suffixed with -in (instrumental)
• Finnish lemmas
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• Northern Ohlone suffixes
• Turkish terms inherited from Ottoman Turkish
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• Turkish terms inherited from Old Anatolian Turkish
• Turkish terms derived from Old Anatolian Turkish
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