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three-box (EN)
adjective, noun

adjective “three-box”

base form three-box, non-gradable
  1. (in automotive design) having a body style with three separate compartments for engine, passenger, and cargo
    This sedan features a classic three-box design with a spacious trunk.

noun “three-box”

singular three-box, plural three-boxes
  1. (in automotive design) a car that has a body with three separate compartments for engine, passenger, and cargo
    The new model is a sleek three-box with improved aerodynamics.