plakkeihin
Plakkeihin is the illative plural form of the Finnish noun plakki. Plakki has several related meanings that all connect with a flat surface or layer: in everyday language it can refer to a dental plaque (a biofilm on teeth), and more broadly to a flat plate, sign or label that bears information. In that broader sense, plakki can denote a physical plaque or panel used for inscriptions or identification. Plakkeihin is used when speaking about movement toward or placement onto multiple such plaques.
In practice, the sense most familiar to many speakers is the literal plate or plaque that carries
Usage notes: plakkeihin is a niche form tied to plural plaques and movement toward them. In many