One of the mysteries of the English language finally explained.
"in pais": in or within the country; relating to or designating actions, matters, etc., which are legally recognized despite not being formally recorded or performed. Also (and now frequently) in "estoppel in pais": estoppel in respect of things expressed or implied by one party, which may not subsequently be disavowed to the detriment of the other party.
Early 17th century; earliest use found in Edward Coke (1552–1634), lawyer, legal writer, and politician. From Law French pais (Anglo-Norman pais), specifically use of Anglo-Norman and Old French, Middle French pais country from post-classical Latin pagensis of or relating to the country or a country district.
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