Portuguese (Brazil) · Pronunciation Guide
ah AH-gwuh. Both a's are open, and the stress sits on the very first syllable of the noun, not the last.
The accent on á looks redundant at first — the word ends in -a, so the default already says stress the second-to-last syllable. But "água" splits as á-gua, and Portuguese requires a written accent on any second-to-last-stressed word that ends in a diphthong, which "-ua" is. The mark exists to satisfy that rule, not to move the stress.
Listen: a água
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Quero um copo de água.
I want a glass of water.
Listen: Quero um copo de água.
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"Quero um copo de água" hides a nice detail: "de água" is written in full but spoken as a rush, "dji AH-gwuh," with the de raised to "dji" as always. And "copo" ends in the unstressed o that Brazilians raise to "oo," so the run of words comes out "KOH-poo dji AH-gwuh."
English speakers put the stress on the wrong syllable and say "ah-GWAH," which sounds like they're reading the Spanish "agua" — and the Spanish word genuinely is stressed there, which is why the transfer is so persistent. Portuguese stresses the first syllable: AH-gwuh. The other slip is dropping the article; "água" is feminine and takes "a," and the phrase is normally learned as a unit.