What is the meaning of the word "two-timer"?

Definitions:

  1. a person who says one thing and does another copy to clipboard noun
    • That twotimer is not to be trusted! copy to clipboard
  2. someone who deceives a lover or spouse by carrying on a sexual relationship with somebody else copy to clipboard noun
    • I thought I could trust my spouse, but they turned out to be a twotimer. copy to clipboard