expression, noun
A loud shout raised by a group, especially in battle or a charge. Also used figuratively for a unified cheer or rallying cry.
兵士たちは鬨の声をあげて敵陣に突撃した。
The soldiers charged the enemy camp with a battle cry.
優勝が決まった瞬間、会場から鬨の声
The moment the victory was decided, a triumphant shout went up from the venue.
雄叫び is a more individual, often fierce or heroic yell, while 鬨の声 is typically a collective battle cry or group shout.
The word 鬨 (とき) originally referred to a war cry or shout raised in battle. Combined with 声 (こえ, 'voice'), it forms the set phrase 鬨の声, meaning a collective battle cry. The kanji 鬨 is composed of 門 (gate) and 共 (together), suggesting a shout raised together at the gate or in battle.