pass out

[Mark A Mandel]

Today's Boston _Globe_ is following the story of a passenger who
suffered a heart attack yesterday and died while the train continued to
make scheduled stops (pp. A1,28). I am baffled by one sentence:

  It is unclear whether the crew realized that Allen was
  unconscious when they reported that he had "passed out."

What else does "pass out" mean, other than 'lose consciousness'?

-- Mark A. Mandel