主しゅ戦せん場じょう

noun

main theater of war; principal battlefield

Refers to the primary location where a war or major battle is fought. Often used in historical or military contexts.

• この地ち域いきは第だい二に次じ世せ界かい大たい戦せんの主しゅ戦せん場じょうだった。

  This region was the main theater of war during World War II.

noun

main market; principal area of competition

Figurative extension: the most important market or competitive arena in business, politics, or other fields.