hyperventilate

from WordNet (r) 3.0 (2006)

hyperventilate
    v 1: produce hyperventilation in; "The nurses had to
         hyperventilate the patient"
    2: breathe excessively hard and fast; "The mountain climber
       started to hyperventilate"

from The Collaborative International Dictionary of English v.0.48

hyperventilate \hyperventilate\ v. i.
   to breathe rapidly and deeply; to breathe excessively; as,
   The mountain climber started to hyperventilate.
   [WordNet 1.5]

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