/ˈmɪstʃɪf ||; ˈmɪstʃɪf/noun [U] bad behaviour (usually of children) that is not very serious （通常指儿童的）恶作剧，顽皮或捣蛋行径: The children in Class 9 are always getting into mischief. 9班的孩子老是捣蛋。