GNU Collaborative International Dictionary of English

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1.       
   Counterbrace, v. t.
   1. (Naut.) To brace in opposite directions; as, “to counterbrace the yards, i. e., to brace the head yards one way and the after yards another”.
   
   [1913 Webster]
   
   
   2. (Engin.) To brace in such a way that opposite strains are resisted; to apply counter braces to.
   
   [1913 Webster]