Usages of päällekkäin
Astiat laitetaan pöydälle päällekkäin.
The dishes are put on the table on top of each other.
Hylly, jolla kirjat ovat päällekkäin, on kallis.
The shelf on which the books are on top of each other is expensive.
Elon.io is an online learning platform
We have an entire course teaching Finnish grammar and vocabulary.