B2 to not be loyal to your country or a person, often by doing something harmful such as helping their enemies背叛,出卖;对…不忠诚
formal If someone betrays something such as a promise, they do not do what they promised.食言;辜负
More examples
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.
to show feelings, thoughts, or a particular characteristic without intending to暴露(想法);流露(情感)
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