seinämiin
Seinämiin is a form that appears in discussions of Finnish morphology and usage as a rarely attested or dialectal variant meaning “to the walls” or “into the walls.” In standard modern Finnish, the ordinary plural illative of the word seinä (wall) is seiniin. The form seinämiin is not part of the everyday, widely taught grammar, and it is typically described as dialectal, archaic, or poetically stylized rather than a mainstream inflection.
The standard illative plural is seiniin, formed from the stem sein- with the illative plural suffix -iin.
Seinämiin is most often encountered in poetry, old prose, or dialectal writing. It may be used to
Finnish grammar, Illative case, Seinä (wall), Seinät (walls).