noun
match against an outside team; interschool game
Used in sports contexts for a game against a team from another school or organization, as opposed to an intra-squad practice.
来週の対外試合に向けて、毎日練習している。
We are practicing every day for the interschool match next week.
対外試合で初めて他校の選手と戦った。
I played against athletes from another school for the first time in an outside match.
Compound of 対外 (taigai, 'outside, external') and 試合 (jiai, 'match, game').