ambitious undertaking; heroic enterprise; grand scheme
Refers to a large-scale, daring, or noble project or endeavor, often with a sense of admiration.
His crossing of Africa was truly a heroic undertaking.
This space development project can be called a grand scheme of humankind.
Compound of 壮 (sō, 'grand, robust') and 挙 (kyo, 'undertaking, action'). The exact historical derivation is uncertain, but the kanji combination conveys a sense of a magnificent endeavor.