Korotkoff sounds

noun plural

Ko·​rot·​koff sounds

variants also Korotkow sounds or Korotkov sounds

kȯ-ˈrȯt-kȯf-ˌsau̇ndz 

: arterial sounds heard through a stethoscope applied to the brachial artery distal to the cuff of a sphygmomanometer that change with varying cuff pressure and that are used to determine systolic and diastolic blood pressure