big gamble; risky speculation; large bet
Refers to a high-stakes gamble, whether literal betting or a risky venture with large potential loss or gain.
That investment was a big gamble, but it succeeded.
He made a huge bet and lost his entire fortune.
Standard kanji spelling.
Variant using 奕, less common.
Compound of 大 (big) and 博打 (gambling). The exact historical derivation is uncertain, but the word is straightforwardly formed from these elements.