丢三落四 diūsānlàsì forgetful Origin Definitions Defs Strokes Stroke Words Sentences Sents 丢 丟 diū verb to lose to lose; to misplace; to be missing something through neglect or accident三 sān numeral three the number three; 3落 là verb to leave behind to leave behind; to forget to bring; to leave out; to omit四 sì numeral four the number four; complex form used for financial purposes is 肆 sì