Portuguese (Brazil) · Pronunciation Guide
BYE-shoo. The x here is a "sh" sound, and the ai is the diphthong in "eye."
The diphthong takes the weight, since "ai" counts as one syllable. No accent needed. Compare "país," where an accent is required precisely because the i there does not merge with the vowel before it.
Listen: baixo
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
A mesa é muito baixa.
The table is very low.
Listen: A mesa é muito baixa.
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
"A mesa é muito baixa" shows the adjective agreeing with a feminine noun, and the x stays "sh" regardless. "Mesa" has an intervocalic s voiced to a z — MEH-zah — so the sentence contains an s that buzzes and an x that hisses, a useful pairing.
Reading x as "ks" gives "BAKE-so," which is the instinctive English approach and completely wrong here. It's "sh." The other issue is semantic: "baixo" covers both short in height and low in position or volume, so "fala baixo" means speak quietly. For short in length you need "curto" instead.