1
as in informant
a person who provides information about another's wrongdoing
the drug mule refused to turn rat without a guarantee of immunity
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2
as in lover
someone who regularly spends time in a particular place
on Friday night the mall rats were out in full force
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3
as in bastard
a person whose behavior is offensive to others
no one can understand what she finds appealing in a rat like him
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as in to leak
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Merriam-Webster unabridged
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