fall off the back of a lorry
非法获得或购买廉价货物
口语·幽默表示来路不明的便宜货
英文释义
to have acquired something illegally or dishonestly
例句
These designer watches are so cheap—they must have fallen off the back of a lorry.
典故来源
源自英国俚语，原指货物从卡车后部掉落被捡走，委婉暗示物品来路不正或为赃物。