gon-gon
A low, resonant banging sound — a heavy door being pounded on, a large bell being struck, or hammering on thick metal.
💡Pounding on a heavy door — 'Someone was banging gon-gon on the front door.'
玄関のドアをごんごん叩いている。
Someone is pounding gon-gon on the front door.
The repairman ___ banged on the pipe to check for blockage.
修理工がパイプを○○と叩いて詰まりを確認した。