One of the mysteries of the English language finally explained.
‘Is it not so?’ Used especially to emphasize the truth or probability of the preceding statement.
Mid 19th century; earliest use found in Tom Taylor (1817–1880), playwright and comic writer. From French n'est-ce pas ‘is it not (so)?’ from ne not + est is + ce it + pas, negative particle, specifically use of pas.
n'est-ce pas/ˌnɛs(ə) ˈpa//ˌnɛs ˈpɑː/
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