Plural of blot; dark spots, stains, or marks on a surface, or figuratively, something that damages reputation.
From blot, likely from Dutch blot or similar Germanic sources meaning 'spot,' used since Middle English to describe visible marks.
A 'blot on one's record' is a common phrase meaning a mistake or failure that damages your reputation—it's a beautiful metaphor because both ink blots and character flaws are hard to erase.
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