Princeton's WordNet
take the Fifth, take the Fifth Amendmentverb
refuse to testify by invoking the Fifth Amendment, which states that nobody may be forced to testify as a witness against himself or herself
Synonyms:
take the Fifth Amendment, take the Fifth
Wiktionary
take the fifthverb
Synonyms:
plead the fifthtake the fifthverb
To decline to comment, especially on grounds that it might be incriminating.Synonyms:
plead the fifth
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