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Webster 1913 Edition
Undouble
Un-dou′ble
,Verb.
T.
[1st pref.
un-
+ double
.] To unfold, or render single.
Definition 2024
undouble
undouble
English
Verb
undouble (third-person singular simple present undoubles, present participle undoubling, simple past and past participle undoubled)