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Wiktionary
two-timing
  1. Who has two-timed another person. n. The practice of being sexually unfaithful. v

  2. (present participle of two-time English)

WordNet
two-timing

adj. not faithful to a spouse or lover; "adulterous husbands and wives"; "a two-timing boyfriend" [syn: adulterous, cheating(a), two-timing(a)]