WordNet (r) 3.0 (2006):

close out
    v 1: make impossible, especially beforehand [syn: preclude,
         rule out, close out]
    2: terminate by selling off or disposing of; "He closed out his
       line of sports cars"
    3: terminate; "We closed out our account"

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "close out":
   balance, balance the books, bar, book, button up, cap, capitalize,
   carry, carry over, carry to completion, cast up accounts,
   charge off, clean up, clear the trade, climax, close the books,
   close up, complete, conclude, convert, convert into cash, credit,
   crown, culminate, cut under, debit, disenable, disqualify, docket,
   dump, effect a sale, end, enter, finalize, finish, finish off,
   finish up, get done, get it over, get through, get through with,
   job, journalize, keep books, liquidate, log, make a sale,
   make an entry, make impossible, market, merchandise, minute,
   mop up, move, note, perfect, post, post up, prohibit, resell,
   retail, round out, rule out, sacrifice, sell, sell off,
   sell on consignment, sell out, sell over, sell retail, sell short,
   sell up, sell wholesale, strike a balance, terminate,
   terminate the account, top off, top out, turn into money,
   turn over, undercut, undersell, unload, wholesale, wind up,
   wrap up