noun
large-scale operation; major campaign; big mission
Used for ambitious, wide-ranging plans, often with a dramatic or strategic tone. Common in military, business, and event contexts.
警察は麻薬組織の摘発に向けて大作戦を展開した。
The police launched a large-scale operation to crack down on the drug ring.
新商品の販売促進のため、会社は全国的な大作戦を計画している。
The company is planning a nationwide campaign to promote the new product.