Do not trust him, he speaks with a forked tongue.
forked tongue
idiomThe characteristic of deceptiveness; duplicity; untruthfulness.
The politician promised lower taxes to everyone, but his opponents claimed he was speaking with a forked tongue.
Despite his charming demeanor and eloquent speeches, the diplomat was known to speak with a forked tongue, often saying one thing to his allies and another to his enemies.
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bite one's tongue
To resist the urge to speak out, especially in order to avoid saying something inappropriate or likely to cause a dispute.
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cat got someone's tongue
Why is someone not saying anything?
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civil tongue
A polite manner of speaking.
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find one's tongue
To speak after being unable to do so or after remaining silent; to find something to say.
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hold one's tongue
To refrain from talking about something.
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keep a civil tongue in one's head
To maintain a polite manner of speaking.
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lay one's tongue to
To say; to name; to think of to say.
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loose tongue
The act or habit of excessively speaking or discussing subjects that are private or confidential.