四一二事变 sìyī'èrshìbiàn April 12 Incident Definitions Defs Origin Strokes Stroke Words Sentences Sents 四 sì numeral four the number four; complex form used for financial purposes is 肆 sì一 yī numeral one one; the number 1; single; alone二 èr numeral two the number two; 2事变 事變 shìbiàn incident A sudden, major political or military event of historical significance; an emergency or exigency