櫓やぐら太だい鼓こ

noun

sumo drum; drum announcing bouts

In sumo, the drum beaten on a tower to signal the start of the day's matches or to draw spectators. Also refers to the sound itself.

• 櫓やぐら太鼓だいこの音おとが聞きこえると、取とり組くみが始はじまる合あい図ずだ。

  When you hear the sound of the sumo drum, it's the signal that the bouts are starting.