Eräänkin

Eräänkin is a Finnish word that functions as an indefinite pronoun or adverb. As an indefinite pronoun, it refers to an unspecified person or thing at some point in the past, often translated as "once," "one time," or "on one occasion." It is the past tense of the indefinite pronoun "eräs." For example, "Eräänkin kerran..." translates to "Once upon a time..." or "On one occasion...".

When used as an adverb, eräänkin can indicate a past, unspecified event or situation. It carries a nuance of something that happened, but the exact details or timing are not precisely known or are being deliberately kept vague. The particle "-kin" attached to "erään" emphasizes this indefiniteness or can suggest a slight surprise or unexpectedness about the occurrence. It highlights that at some point, this particular thing or event happened, even if it wasn't particularly significant or memorable in detail. It's a way of referring to a past instance without pinpointing it.