drop back   (TTS發音)

1. fall back in position落後；地位倒退

    I've dropped back in work. 我的工作落後了。

    He has dropped back to fifth in his class. 他在班上的名次已經退到第5名。

2. lessen減少；減輕

    The unemployment figures dropped back last month. 上月的失業人數下降了。

    As the medicine took effect，the symptoms dropped back. 隨著藥物的作用，症狀減輕了。

3. move or step backwards； retreat退後；撤退

    The enemy dropped back before our army's attack. 我軍還沒有發動進攻，敵軍就撤退了。