内忧外患 nèiyōuwàihuàn domestic strife and foreign aggression Origin Definitions Defs Strokes Stroke Words Sentences Sents 内忧 內憂 nèiyōu domestic troubles troubles or unrest from within a country or organization外患 wàihuàn foreign aggression Trouble or disaster coming from the outside, usually referring to foreign aggression or invasion; an external threat.