プログレッシブ和英中辞典(第３版)の解説
せんしょう【先勝】
1 〔先に勝つこと〕winning the first game or match of a series
先勝する｜win the first match [game] (▼matchはテニスなどで，gameは野球などで)
2 〔六曜の一つ〕a day on which bold actions are supposed to turn out well; a day supposed to be lucky in the morning and unlucky in the afternoon