[1] : The Collaborative International Dictionary of English v.0.48

check out \check` out"\ v. i.
   1. to vacate a room at a hotel, notel, etc. converse of
      check in.
      pjc

   2. to die. colloq.
      pjc
see also:
check in 

[2] : The Collaborative International Dictionary of English v.0.48

check out \check" out\ v. t.
   1. to inspect or examine. colloq.
      pjc

   2. to make a record of having borrowed something for
      temporary use; as, to check out a book at the library; to
      check out equipment from a depository.
      pjc

   3. to bring items to be purchased to a checkout counter
      as at a supermarket or other retail store where the
      prices may be totaled and the bill may be paid.
      pjc
see also:
checkout counter 

[3] : WordNet (r) 2.0

check out
     v 1: examine so as to determine accuracy, quality, or condition;
          "check the brakes"; "check out the engine" syn: check,
           check up on, look into, suss out, check over, go
          over, check into
     2: announce one's departure from a hotel ant: check in
     3: be verified or confirmed; pass inspection; "these stories
        don't check" syn: check
     4: trace; "we are running down a few tips" syn: run down
     5: record, add up, and receive payment for items purchased;
        "she was checking out the apples that the customer had put
        on the conveyer belt"
     6: withdraw money by writing a check syn: cheque
     7: try to learn someone's opinions and intentions; "i have to
        sound out the new professor" syn: sound out, feel out
see also:
check check up on look into suss out check over go over 
check into check in run down cheque sound out 
feel out 

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

87 moby thesaurus words for "check out":
   audit, autopsy, balance, balance the books, buy it, canvass,
   cash in, check, check and doublecheck, check in, check over,
   check up on, clock out, collate, confirm, conform, conk,
   correspond, croak, cross-check, demonstrate, die, double-check,
   dovetail, drop, drop off, examine, fit in, gee,
   give an examination, go over, go west, harmonize, have it,
   have the qualifications, inspect, inventory, jibe, kick in,
   kick off, kick the bucket, knock off, look at, look over,
   measure up, monitor, observe, overhaul, overlook, pass, pass away,
   pass out, pass over, pass under review, peer at, peg out, peruse,
   pipe off, pop off, pore over, postmortem, prove, punch out,
   qualify, recheck, review, ring out, run over, scan, scrutinize,
   set an examination, shove off, sign out, size, size up, square,
   step off, study, survey, take stock, take stock of,
   take the measure, tally, test, triple-check, validate, verify

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