プログレッシブ和英中辞典(第4版)の解説
ういじん【初陣】
&fRoman1;〔初の戦闘〕one's first campaign [battle](▼campaignは一連の戦い,battleは個々の戦い)
初陣に出る
go on one's first campaign
&fRoman2;〔初の競技〕
それが彼の初陣だった
That was the first match [game] he participated in.
初陣の時はすっかり興奮した
I was quite excited when I played my first game.