whistle in the dark
徒勞無益地試圖保持鎮靜或充滿信心
口語·表達強裝鎮定或樂觀
英文釋義
to remain optimistic or hopeful in a difficult or uncertain situation
例句
He knew the exam was tough, but he kept whistling in the dark to calm his nerves.
典故來源
源自人們在黑暗或危險環境中吹口哨以壯膽的行為，比喻試圖掩飾恐懼或保持樂觀。