two-time - definition and synonyms

verb [transitive] informal 

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present tense
I/you/we/theytwo-time
he/she/ittwo-times
present participletwo-timing
past tensetwo-timed
past participletwo-timed
  1. to be dishonest with your sexual partner by secretly having a relationship with another person at the same time

    Are you sure he’s not two-timing you?

derived word

two-timer

noun [countable]
singulartwo-timer
pluraltwo-timers