betray someone's trust

idiom

Definition of betray someone's trust

: to do something very bad and hurtful to someone that causes a loss of respect You stole from us. You've betrayed our trust.

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“Betray someone's trust.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/betray%20someone%27s%20trust. Accessed 25 Sep. 2020.

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