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comparative more flattened, superlative most flattened
Made flat by something. quotations examples
Fibreglass mouldings form the domed roof at the driving ends and the drop roof of the motor coach, which joins the elliptical section of the flattened portion under the pantograph.
1960 November, “New electric multiple-units for British Railways: Manchester/Liverpool and Crewe”, in Trains Illustrated, page 660
simple past and past participle of flatten examples