一いっ鼓こ

noun

first beat of the war drum

Historical military term referring to the initial drum signal used to rally or advance troops. Rare in modern Japanese outside of historical or literary contexts.

• 一いっ鼓この合あい図ずで兵へいたちは一いっ斉せいに進すすみ始はじめた。

  At the signal of the first drumbeat, the soldiers began to advance all at once.