Plural of hardtop; multiple cars with rigid metal roofs or multiple paved hard-surfaced areas.
From 'hardtop' (hard + top) plus the English plural suffix -s. The term generalized from singular usage in 1950s automotive terminology.
Hardtops became so popular in the 1950s-60s that they eventually replaced traditional convertibles in the mass market, showing how consumer preferences shifted toward practicality disguised as style.
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