noun
epic film; big-budget movie
Refers to a movie produced on a grand scale with a large budget, often featuring spectacular visuals, a sweeping story, or an all-star cast.
今年の夏休みに大作映画が何本も公開される。
Several big-budget movies will be released during this summer vacation.
彼は大作映画の監督として有名になった。
He became famous as a director of epic films.
Compound of 大作 (large-scale work) and 映画 (movie). The exact historical derivation is uncertain, but the term follows a common pattern for describing film genres by scale.