Portuguese (Brazil) · Pronunciation Guide
SHAY-oo. Starts with "sh," and the ending is a separate quick "oo."
Two syllables, and the first is loud, as the -o ending requires. Syllabification is the subtle part: "ei" fuses into one beat while the following o stands alone, so the split is chei-o. Portuguese diphthongs always involve an unstressed i or u, which is exactly why the o here can't join in.
Listen: cheio
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O ônibus está cheio.
The bus is full.
Listen: O ônibus está cheio.
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"O ônibus está cheio" uses "ônibus," one of the small set of words accented three syllables from the end. In speech "está" reduces to "tá," and the s of "ônibus" runs into that reduced verb, so the whole phrase compresses to something like OH-nee-boos-tá-SHAY-oo.
Reading ch as English "ch" gives "CHAY-oh," and it's the reflex for anyone arriving from Spanish or Italian. Make it "sh." The final o is the second issue, left unraised by English speakers. And the feminine "cheia" changes the ending without moving the stress, which learners often over-adjust.