[1] : WordNet (r) 2.0

snarl up
     v : make more complicated or confused through entanglements
         syn: snarl, embrangle
see also:
snarl embrangle 

[2] : Moby Thesaurus II by Grady Ward, 1.0

41 moby thesaurus words for "snarl up":
   ball up, bollix, bollix up, bugger, bugger up, complicate,
   confound, confuse, cook, embrangle, entangle, foul up, fumble,
   garble, gum up, hash up, implicate, involve, jumble, knot,
   louse up, mess up, mix up, muck up, muddle, perplex, pi,
   play hell with, play hob with, queer, ramify, ravel, riffle,
   scramble, screw up, shuffle, sink, snafu, snarl, tangle, tumble

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Bang Up >> B Words
Bang Up, definition of term: Bang Up
bang+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html