勿谓言之不预

1. • don't say you haven't been forewarned (threat used by the PRC in international diplomacy)

     idiom

Character by character

• 勿(wù)do not
• 谓(wèi)surname Wei
• 言(yán)words
• 之(zhī)(possessive particle, literary equivalent of 的 de)
• 不(bù)no
• 预(yù)advance