The Collaborative International Dictionary of English v.0.48:

Interchain \In`ter*chain"\, v. t. [imp. & p. p. Interchained;
   p. pr. & vb. n. Interchaining.]
   To link together; to unite closely or firmly, as by a chain.
   [1913 Webster]

         Two bosoms interchained with an oath.    --Shak.
   [1913 Webster]