emit a sound ( synonym found)
Definition of emit a sound:

°sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz.
°(medicine) The use of ultrasonic waves for diagnostic or therapeutic purposes.
Definition of emit a sound:

°sound with a frequency greater than the upper limit of human hearing; approximately 20 kilohertz.
°(medicine) The use of ultrasonic waves for diagnostic or therapeutic purposes.
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