Portuguese (Brazil) · Pronunciation Guide
seh-NOWNG. Ends in the -ão nasal diphthong, hummed entirely through the nose with nothing closing it.
Words ending in the nasal diphthong -ão are end-stressed by rule, so the weight goes to the last syllable and the tilde is marking nasality rather than placement. The word is transparently "se" plus "não" fused together, and as usual in Portuguese compounds the second element's stress survived the merger untouched.
Listen: senão
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Vamos agora, senão chegamos tarde.
Let's go now, otherwise we'll be late.
Listen: Vamos agora, senão chegamos tarde.
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"Vamos agora, senão chegamos tarde" links "vamos agora" across the vowel boundary and then pivots on "senão." That word's nasal glide runs into the "sh" of "chegamos," and the sentence ends on "tarde" with its palatalized "djee" — three quite different consonant textures in one line.
Closing the -ão with an audible g or n is the standard error; the sound stops while still resonating. Learners also break it into two syllables. On usage, "senão" means otherwise in this warning sense, but it can also mean except in other contexts, and the two are distinguished only by the structure around them.