掉队diào∥duì 1.结队行走时落在队伍的后面{drop behind; fall behind; lag; fail to keep pace with the group}: 在接连三天的急行军中,没有一个人～。{No one dropped behind in the three-day forced march.} 2.〈比喻fig.〉落在客观形势的后边{lag behind; become outdated or old-fashioned}: 只有加紧学习才不致～。{One can only keep pace with the times by studying hard.}