idiom
to keep one's chin up
困難な状況で前向きで希望に満ちた状態を保つ
Meaning
to stay positive and hopeful in a difficult situation
Example
Even though she lost the game, she managed to **keep her chin up** and stayed positive.
ゲームに負けたにもかかわらず、彼女は **顔を上げて**前向きでい続けました。