Etymology
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red ink (n.)

"financial losses, the debit side of an account," 1929, from the red ink traditionally used to indicate debits in accounts. Earlier, "cheap wine" (1919).

updated on May 31, 2021

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Definitions of red ink from WordNet

red ink (n.)
the amount by which the cost of a business exceeds its revenue;
Synonyms: loss / red
From wordnet.princeton.edu, not affiliated with etymonline.