Etymological question

[Francisc Czobor]

I have read recently (World Lexicon of Grammaticalization, by B. Heine & T. Kuteva, Cambridge University Press, 2002, page 118) that in "Grand Ronde Chinook Jargon" _sim_ (with an acute accent over i, probably indicating length) means "to swim".
  My question is: where comes this "sim" from?
   
  Is it from English "swim" ? (The word "swim" appears in Kamloops CJ, in Jacob's CJ texts told by Thomas Paul and in J.B. Good's dictionary of 1880, all these reflecting the CJ of British Columbia)
   
  Or maybe GRCJ "sim" is a contraction of the CJ word sichEm (sitshum, shetshom, shetsum, shetsham, etc.) "to swim" which, according to Gibbs, comes from Chehalis?
   
  Or, the third possibility, "sim" is a combination/compromise of both "swim" and "sichEm"?
   
  Hayu masi pus k'ilapay wawa.
  Francisc

 		
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