siny: "woman", primarily 'Iipay word
'eshin: "one, is one." 'Ehin in 'Iipay, usually shortened to shin in Tiipay, especially in fast speech.
As numbers are verbs, this is literally, "woman is one."
When introducing new characters to the discussion, the word for "one" may be used like the English indefinite article "a/an", as in, nyaapum siny 'eshin... "and then a woman..." Or, 'eshin may be used literally to mean "one woman".