on pain ofWiktionary 原文英/ɒn ˈpeɪn əv/美/ɑn ˈpeɪn əv/词源说明From on + pain (“suffering inflicted as punishment or penalty”) + of; compare French sous peine de.释义介词preposition1Used to warn of consequences if a specified act is done or not done: subject to the punishment of (some penalty); or (generally) subject to the circumstance of (some thing).