For two adjacent strings, bend the lower string so its pitch rises to match the higher string. Use the thumb or index finger to sweep across both strings, in a gesture away from the performer. Pressing the lower string after it is struck and creating an audible slide is a different technique called huayin shuangyin (Kwok).

This may be considered the name of the category. Ferguson’s source A adds that using the index finger is its own named technique: Qiè 切. Kao says the shandong school refers to using the thumb in this way as Lín Xián Tóngyīn 邻弦同音 “Adjacent Strings in Unison”.