Πεστρέφιν/Peşrev

Apparently, Cypriot musicians refer to the refrain of various songs as ‘πεστρέφιν’. A quick search didn’t bring up any results, apart from this kid playing a ‘pestrefin’ from the ‘Mariniotou’ fone on the piano.

It looks like the word 'πεστρέφι' renders ‘Peşrev’ in Greek (see mentions e.g. here, here). Peşrev, as the wikipedia article linked above clarifies, does not mean refrain, but is a compositional form in Ottoman classical music. It's usually part of a suite (fasıl). Here's an example of an Ottoman peşrev in the maqam (mode) huseyni, composed in the 19th century (if I'm not mistaken) by Andonis Kyriazis: