Having a strong desire to win; competitive or combative in spirit.
彼女は勝ち気な性格で、スポーツでは負けたくないと言っている。
She has a competitive personality and says she doesn't want to lose in sports.
試合中は勝ち気なところが出た。
Her competitive side came out during the match.
勝ち気で負けず嫌いだから、最後まで諦めなかった。
Because she's competitive and hates losing, she didn't give up until the end.
子どもの頃から勝ち気な子だった。
She was a competitive child from an early age.