noun
ambitious undertaking; heroic enterprise; grand scheme
Refers to a large-scale, daring, or noble project or endeavor, often with a sense of admiration.
彼のアフリカ横断はまさに壮挙だった。
His crossing of Africa was truly a heroic undertaking.
この宇宙開発計画は人類の壮挙と言える。
This space development project can be called a grand scheme of humankind.