bread-and-butter model

American  

noun

1. Naval Architecture.  a wooden hull model carved from a number of horizontal planks glued together to represent the outlines of the various decks.

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Example Sentences

Hyundai's bread-and-butter model, however, is pitted against imports such as Volkswagen's Passat and Toyota's Camry which are benefiting from free-trade deals.

From Reuters

Next year the PhoeniX will be transformed into a replacement for the brand’s bread-and-butter model, the 9-3.

From Economist