hyperventilate

hy|per|ven|ti|late /h'aɪpərventɪleɪt/ (hyperventilates hyperventilating hyperventilated)
[VERB] V
If someone hyperventilates, they begin to breathe very fast in an uncontrollable way, usually because they are very frightened, tired, or excited.
I hyperventilate when they come near me with the needle.
hyperventilation [N-UNCOUNT]
Several notable researchers are studying the effects of hyperventilation.

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