undouble

[uhn-duhb-uh l]
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verb (used with object), un·dou·bled, un·dou·bling.

to unfold; render single.

Origin of undouble

First recorded in 1590–1600; un-2 + double
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for undouble

Historical Examples of undouble