Peittyisivät
Peittyisivät is a Finnish word, the third-person plural conditional passive form of the verb "peittyä". "Peittyä" translates to "to be covered," "to become covered," or "to disappear under something." Therefore, "peittyisivät" literally means "they would be covered" or "they would become covered."
This grammatical form indicates a hypothetical or conditional situation in the past or present, referring to