0 present participle of betray
1 to not be loyal to your country or a person, often by doing something harmful such as helping their enemies:
2 to show feelings, thoughts, or a particular characteristic without intending to:
Vargas plays the part of treacherous aristocrat who betrays his king and country.
Didn't he feel guilty about betraying his fellow countrymen and women?
I trusted him and he betrayed me.
After a bitter ten-year campaign, William Wallace was betrayed and executed in London in 1305.
At the height of Stalin's rule, children were encouraged to betray their parents.
The gender performance he plays is intended to beguile his audience into betraying her innermost feelings.
One can also sense trepidation in their remonstrations, betraying the conviviality as politeness masking palpable unease.
Often these were adapted from stables and outhouses, betraying no outward sign of their purpose.