si us plau - Wiktionary, the free dictionary

• sisplau, sis plau (informal)

Literally, “if it pleases you”. Compare Occitan se vos plai, French s’il vous plaît, and Franco-Provençal se vos plét.

• IPA^(key): (Central, Balearic, Valencia) [si us ˈplaw]

si us plau

1. please

   Synonyms: (chiefly Valencia) per favor, (Alghero) per plaier

• Used in formal and informal contexts, regardless of the formal pronoun us.

• si et plau
• si li plau

• “plaure” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.