Historically, girdles were common fashion accessories and signified femininity. My grandmother showed me the elegant girdle she wore in the '60s.
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Modern Usage
Today, girdles are less common and often replaced by more modern shapewear. Girdles aren't in vogue nowadays, but some prefer them for their vintage feel.
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Metaphoric Use
The word 'girdle' can be used metaphorically to describe something tightly encircling something else. The river formed a natural girdle around the small village.