hyperventilate

UK: /ˌhaɪpə^rˈvɛntɪleɪt/

US: /ˌhaɪpɚˈvɛntəˌleɪt/

US: (hī′pər ven′tl āt′)

Inflections of 'hyperventilate' (v): (⇒ conjugate)

hyperventilates

v 3rd person singular

hyperventilating

v pres p

hyperventilated

v past

hyperventilated

v past p

WordReference Random House Learner's Dictionary of American English © 2026

hy•per•ven•ti•late /ˌhaɪpɚˈvɛntəˌleɪt/   v., -lat•ed, -lat•ing. [no object]

1. to undergo hyperventilation.

WordReference Random House Unabridged Dictionary of American English © 2026

hy•per•ven•ti•late  (hī′pər ven′tl āt′), v., -lat•ed, -lat•ing. 
v.i. 

1. Physiology to be afflicted with hyperventilation;
   breathe abnormally fast and deep.

v.t. 

2. Medicine, Physiology to cause (a patient) to breathe more rapidly and deeply than normal.

• back formation from hyperventilation 1930–35

Collins Concise English Dictionary © HarperCollins Publishers::

hyperventilate / ˌhaɪpəˈvɛntɪleɪt/ verb

1. (intransitive) to breathe in an abnormally deep, long, and rapid manner, sometimes resulting in cramp and dizziness