wheezing

/W IY1 Z IH0 NG/
verb
  1. 1

    To breathe hard, and with an audible piping or whistling sound, as persons affected with asthma.

noun
  1. 1

    The quality or symptom of breathing with an audible wheeze

Source: https://en.wiktionary.org/wiki/wheeze, https://en.wiktionary.org/wiki/wheezing