Undergird Definition
 ŭndər-gûrd 
  undergirded, undergirding, undergirds, undergird
  
    verb
  
 
    undergirded, undergirding, undergirds
  
To gird, strengthen, or brace from the bottom side.
 Webster's New World 
To supply support or a strong basis for.
 Webster's New World 
To secure below or underneath.
Wiktionary 
Synonyms: 
  Origin of Undergird
-  
From under- +"Ž gird.
From Wiktionary
 
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