A great difference or wide margin; a large gap in score, opinion, degree, etc.
彼はライバルに大差で勝利した。
He won by a wide margin over his rival.
商品の品質には大差があり、価格に反映されている。
There is a big difference in product quality, which is reflected in the price.
経験の差が大きく、仕事の進み方に大差が出た。
The difference in experience was large, and it showed in how the work progressed.