打掩护dǎ yǎnhù 1.在主力部队的侧面或后面跟敌人作战,保护主力部队完成任务。{provide cover for the main force by engaging the enemy by the flank or in the rear} 2.〈比喻fig.〉遮盖或包庇(坏事、坏人){shield; give refuge to (sb. or sth. bad)}: 事情已经调查清楚,你用不着再替他～了。{We have found out; you needn't shield him any more.}