Meaning of alleleu in English:

alleleu

Pronunciation /ˌalɪˈluː/

exclamation

(also aililiú)
rare Irish
  • Expressing distress, horror, surprise, etc.

    In later use only in Irish-speaking contexts.

Origin

Late 17th century (in an earlier sense). Apparently from Irish aililiú, interjection indicating surprise or sorrow (although this is first attested later: 1740 or earlier), of imitative origin.