Portuguese (Brazil) · Pronunciation Guide
ah VESS. A tight closed e, and the final z is pronounced as an s.
A monosyllable ending in z, stressed by default and unaccented — the same pattern as feliz, rapaz and luz. The plural "vezes" puts the z between vowels, where it buzzes properly, and adds a syllable that pulls the stress onto the second-to-last position by the ordinary rule.
Listen: a vez
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Vi isso uma vez.
I saw that once.
Listen: Vi isso uma vez.
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"Vi isso uma vez" links "vi isso" across two vowels with no break, and the final z of "vez" stays unvoiced because nothing follows it. "Isso" has a double s kept unvoiced between vowels, so the sentence contains three unvoiced sibilants and no z sound at all.
Voicing the final z is the reading error, and opening the vowel is the second. Say "VESS" with a tight e. The bigger practical issue is the vez/hora distinction: "vez" is an occasion and "hora" is clock time, so "uma vez" is once and "uma hora" is an hour.