Half a truth is often a great lie.

Actions speak louder than words.

Once in a blue moon, we catch someone red-handed when they are trying to pull the wool over our eyes.

Caught with their hand in the cookie jar, weaving a web of lies, playing fast and loose with the truth.

crying wolf together

An ounce of prevention is worth a pound of cure.

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I’ve always been partial to idioms – stay tuned.