Entry 1 sense Webster, 1913 Mismanage /mĭs-măn'-ĭj/ · Mis·man·age · IPA /mɪsˈmæ.nədʒ/ 01 v. t. & i. To manage ill or improperly; as, to mismanage public affairs. 1. To manage ill or improperly; as, to mismanage public affairs.