Suspect dishonesty or fraud.
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To sense that something dishonest or suspicious is happening.
When you smell a rat, your instincts are telling you something isn't right — even if you can't prove it yet.
It's used when a situation or person feels deceptive and you begin to suspect foul play.
"Raise a Red Flag"
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To signal that something is potentially problematic or concerning
"Have a Bad Feeling"
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A general sense of unease about a situation, without suspecting deception specifically
"Smell a Rat"
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Sensing through instinct that someone is being dishonest or deceptive