philanderer
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/fɪˈlændərər/
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/fɪˈlændərə(r)/
A person, especially a man, who has romantic or sexual relationships with many different people, often while pretending to be faithful to one person.
The scandal revealed him to be a philanderer, shocking his friends and family.
丑闻揭露他是个花花公子,让他的朋友和家人感到震惊。