Portuguese (Brazil) · Pronunciation Guide
ah TAH-djee. With the article it's the noun for afternoon; the same word without one means "late."
Loud on "tar-," exactly as in the adverb spelled the same way. What's worth attention here is grammatical rather than rhythmic: Portuguese distinguishes the noun from the adverb purely by the presence of an article and by position in the sentence, since the two are phonetically identical. "Boa tarde" and "está tarde" contain the same syllables doing completely different work.
Listen: a tarde
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Boa tarde! Posso ajudar?
Good afternoon! Can I help you?
Listen: Boa tarde! Posso ajudar?
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"Boa tarde! Posso ajudar?" is the standard afternoon greeting, used from roughly midday until dark. "Posso" has a double s kept unvoiced, and "ajudar" contains a soft "zh" and a vanishing final r — so the exchange moves from a breathy rasp into a palatal fricative.
Beyond the usual hard-d error at the end, the practical difficulty is knowing which greeting to use when. "Bom dia" runs until midday, "boa tarde" until dark, and "boa noite" after that — and Brazilians switch on the actual light level rather than the clock, so an overcast afternoon can get an early "boa noite."