Definition from macmillandictionary.com
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In wartime many people accused of betraying their country were executed.
She realized that one of her friends must have betrayed her.
They felt their assistant had betrayed their trust in publishing his diaries.
She had betrayed all her beliefs and told a lie.
Rabbits betray their presence with fresh soil outside their burrow.
His comments betray a lack of understanding.
The woman’s face betrayed no emotion.