nappeihin

Nappeihin is a Finnish word that functions as the illative plural form of the noun nappi (button) or napit (buttons). In Finnish, the illative case expresses movement toward or into something, and the plural form is used when the reference is to multiple buttons. Therefore nappeihin means “to the buttons” or “into the buttons.”

Morphology and pronunciation are governed by Finnish phonology and noun-class patterns. The singular illative of nappi is nappiin (to the button), while the plural illative is nappeihin (to the buttons). The form illustrates how the illative suffix interacts with the stem and how consonant gradation and vowel harmony shape the ending.

Usage and context: nappeihin appears in descriptive, instructional, or technical writing where actions or directions involve several buttons—such as garment construction, upholstery, electronics, or control panels. It is not used when referring to a single button in isolation; for a single button the form would be nappiin.

See also: nappi, napit, Finnish grammar, illative case.