biān​gǔ

side drum

边鼓 邊鼓 biān​gǔ
side drum
a type of percussion instrument used by the Zhuang people of Guangxi, typically made of wood or bamboo with a narrow frame and single skin head
side hits
(bound form) drumbeats on the edge of a drumhead, which produce a weaker sound; figuratively refers to things that play a supporting or auxiliary role