scarlet letter
Noun
Meaning
the letter A in red; Puritans required adulterers to wear it
Source: WordNetSynonyms
bar sinister
mark of Cain
badge of infamy
auburn blot
coral tag
cherry brand
garnet sign
being disabled
cardinal imprint
sanguine stamp
violet stain
with the mark of cain
blood-red label
burgundy token
carmine badge
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Hypernyms
Examples
“If I could brand them with a scarlet letter on their forehead I would, because I don’t want any woman hurt like that again.”
It’s harder to prove that friendship has made a reporter a pushover for his sources, so platonic relationships tend to go uncontested, and we stupidly reserve the scarlet letter of lost impartiality for romancing journalists only.