[1] : WordNet (r) 2.0

sit back
     v 1: settle into a comfortable sitting position syn: take it
          easy
     2: be inactive or indifferent while something is happening;
        "don't just sit by while your rights are violated" syn:
        sit by
see also:
take it easy sit by 

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

18 moby thesaurus words for "sit back":
   be a sideliner, be still, coast, delay, do nothing, drift,
   hang fire, hibernate, idle, lie dormant, not budge, not stir, rest,
   sit it out, stagnate, vegetate, wait and see, watch and wait

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