two-time
verb
ˈtü-ˌtīm 
two-timed; two-timing; two-times
transitive verb
1
: to betray (a spouse or lover) by secret lovemaking with another
2
: double-cross
two-timer noun
Synonyms
- backstab
- betray
- cross
- double-cross
- sell (out)
See all Synonyms & Antonyms 
Word History
First Known Use
1924, in the meaning defined at sense 2
two-time
verb
as in to betray
to be unfaithful or disloyal to an entrepreneur who's supposedly two-timed every business partner she's ever had Synonyms & Similar Words
Relevance
- betray
- cross
- double-cross
- backstab
- stab in the back
- sell down the river
- give away
- peach
- snitch (on)
- sell (out)
- turn in
- go back on
- inform (on)
- shop
- tell (on)
- split (on)
- rat (on)
Antonyms & Near Antonyms
- defend
- guard
- protect
- save
- stand by
- safeguard
- shield