Definition of detumesce in US English:

detumesce

verb

[no object]
  • Subside from a state of stiffness, swelling, or sexual arousal.

    ‘the erection he had detumesced immediately after orgasm’

Pronunciation

detumesce

/ˌdit(j)uˈmɛs//ˌdēt(y)o͞oˈmes/