Päillä
Päillä is the plural adessive form of the Finnish noun pää, meaning head. It translates roughly to “on the heads” and is used to describe the location of something in relation to multiple heads. The form arises when describing a plural subject or group in which the location is on top of those heads, such as people or animals.
In Finnish, the singular adessive for head is päällä (on the head). For plural, the nominative plural
Päillä is relatively rare in everyday speech and is primarily encountered in descriptive, literary, or precise
Finnish grammar: adessive case, plural forms, noun pää (head). Related discussions include distinctions between päillä (plural