The Collaborative International Dictionary of English v.0.48:

Immesh \Im*mesh"\, v. t. [imp. & p. p. Immeshed; p. pr. & vb.
   n. Immeshing.] [Pref. im- in + mesh. Cf. Inmesh.]
   To catch or entangle in, or as in, the meshes of a net. or in
   a web; to insnare.
   [1913 Webster]