two-time
verb (used with object)
to be unfaithful to (a lover or spouse).
Used to describe an ongoing action or continuous state that was happening at a specific time in the past.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
For example, the Kitty Cams study found that four of the cats were two-timing their owners, visiting other homes for food and affection.
From New York Times ● Jan. 20, 2013
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