Bō yīn 波音 “Mordent” or Lián yīn 漣音 “Rippling Sound”

Pluck a string then a moment later, press the string to raise the pitch 1-3 half steps and release it. This creates a rapid alternation around a target pitch, known is western music as a mordent. It is a fast technique performed on shorter notes such as eighth or sixteenth notes. Kwok considers it a vibrato, offers the synonym shuanq rouyin and says the strong should be pressed twice.