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Yours, Etc.: Origins and Uses of 8 Sign-Offs

undouble

[uhn-duhb-uh l] /ʌnˈdʌb əl/
verb (used with object), undoubled, undoubling.
1.
to unfold; render single.
Origin
1590-1600
1590-1600; un-2 + double
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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