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The sources I consulted (HowJsay, Forvo, Wordreference) say the “s” is not silent. So it may be an exception from the rule, such as “autobus”, “tennis”. Can you confirm that?
The reason I ask is because in Canadian English the “s” is silent and as a borrowing from French, that would be strange.
I confirm the s is not silent, like in tennis.
In the International Phonetic Alphabet (IPA):
Like you would pronounce the verb “tisser” at the first person singular: “tisse”.
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