这个习语的核心在于对比“语言”与“行动”。它传达了一种观点：口头承诺或吹嘘是非常容易且廉价的，而真正证明一个人意图或能力的是其实际行动。它常用于表达对某人不切实际承诺的怀疑。

• Actions speak louder than words ^{事实胜于雄辩}
• He says he’s going to start his own company, but talk is cheap. ^{他说他要自己创业，但话谁都会说（得看他做不做）。}
• My boss promised us a bonus last year, but talk is cheap; we haven’t seen any extra money yet. ^{我老板去年答应给我们奖金，但光说不练假把式，我们到现在还没见到钱。}
• If you really want to help, show me—talk is cheap. ^{如果你真的想帮忙，就做给我看——口说无凭。}