trophy wife
US /ˈtroʊ.fi ˌwaɪf/
UK /ˈtroʊ.fi ˌwaɪf/
1.
a young, attractive wife, typically of a rich and successful older man, regarded as a status symbol for her husband.
:
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He introduced his new, much younger wife, who many whispered was his trophy wife.
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She felt like nothing more than a trophy wife, valued only for her appearance.