game的字義

今天閱讀一篇有關醫療旅遊的文章，
看到一個句子
...even 19% of those who have insurance say they're game.
從句子結構來看，
game應該是個形容詞。

game:
prepared to join in with or to try a new, difficult, or dangerous activity
(情願的,對...有意的)

閱讀除了能增廣見聞，也能學到許多字的用法，也真有趣。