hy·per·ven·ti·late 
/ˌhaɪpɚˈvɛntəˌleɪt/ verb
hy·per·ven·ti·lates; hy·per·ven·ti·lat·ed; hy·per·ven·ti·lat·ing /ˌhaɪpɚˈvɛntəˌleɪt/ verb [no obj] : to breathe very quickly and deeply
▪ The boy panicked and began hyperventilating. ◊When you hyperventilate you breathe so quickly that you begin to feel dizzy. Hyperventilate is also sometimes used figuratively to describe a person who is becoming very upset or excited but not actually breathing quickly.
▪ The latest economic news has prompted a lot of hyperventilating on Wall Street. [=people on Wall Street are very upset about the news]
▪ The boy panicked and began hyperventilating. ◊When you hyperventilate you breathe so quickly that you begin to feel dizzy. Hyperventilate is also sometimes used figuratively to describe a person who is becoming very upset or excited but not actually breathing quickly.
▪ The latest economic news has prompted a lot of hyperventilating on Wall Street. [=people on Wall Street are very upset about the news]
— hy·per·ven·ti·la·tion /ˌhaɪpɚˌvɛntəˈleɪʃən/ noun [noncount]
/ˌhaɪpɚˌvɛntəˈleɪʃən/ noun [noncount]
