at the drop of a dime
立刻或毫不猶豫地做某事
口語·表示立即行動或毫不猶豫
英文釋義
to do something immediately or without hesitation
例句
She would help her friend at the drop of a dime, no questions asked.
典故來源
源自美國20世紀中期，投幣電話中一枚10美分硬幣（dime）掉落即可立即通話，比喻行動迅速毫不猶豫。