deep-dishDefinition of deep-dish adjective chiefly North American 1(of a pie) baked in a deep dish to allow for a large filling:deep-dish apple pie (also deep-pan) (of a pizza) cooked in a deep dish and having a thick dough base. 2 informal extreme or thoroughgoing:deep-dish conservatismdeep-dish in other Oxford dictionaries Definition of deep-dish in the US English dictionary