French · Pronunciation Guide
plüss when it means "more" with a quantity — but the "s" goes silent in comparatives, so "plus grand" is "plü grahn". Same spelling, two pronunciations.
One syllable. What varies is not stress but that final "s", and the choice actually disambiguates meaning — "je n'en veux plus" with a silent "s" means "I don't want any more", while "j'en veux plus" with the "s" sounded means "I want more".
Listen: plus
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Je voudrais un peu plus de pain.
I'd like a little more bread.
Listen: Je voudrais un peu plus de pain.
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"Je voudrais un peu plus de pain" is the quantity sense, so most speakers pronounce the "s": /ply.s də pɛ̃/. The whole phrase "un peu plus de" is a standard chunk meaning "a little more of". "Pain" ends in the nasal vowel /ɛ̃/ with a silent "n", so it is one beat, not two.
Learners pick one pronunciation and use it everywhere, which produces sentences that are technically ambiguous to a French ear. The vowel is the other issue: "ploos" is the automatic English reading, but this is the tight /y/, so it sounds closer to "plüss". Get both right and you will also stop confusing "plus" (more) with "ne... plus" (not any more), which are distinguished in speech precisely by that final "s".