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Webster 1913 Edition
Unbrace
Un-brace′
,Verb.
 T.
 [1st pref. 
un- 
+ brace
.] To free from tension; to relax; to loose; 
as, to 
. unbrace 
a drum; to unbrace 
the nervesSpenser.
 Webster 1828 Edition
Unbrace
UNBRA'CE
,Verb.
T.