zipper clause. Contracts. A contractual provision that operates both as an integration clause and as a no-oral-modification clause. See INTEGRATION CLAUSE ; NO-ORAL-MODIFICATION CLAUSE.
“[A] ‘zipper clause’ … so called because the combination of the integration clause and the no-oral-modification clause is intended to foreclose claims of any representations outside the written contract ….” Pace v. Honolulu Disposal Serv., 227 F.3d 1150, 1159 (9th Cir. 2000).