double-quick是副词，也是形容词，它的意思是“very quickly”，即“十分迅速，马上，立即”。in double-quick time的意思等同于“as quickly as possible”，意思是“马上，尽快”。

【例句】
Amy left the room double-quickwhen I started singing.
我刚一开始唱歌，艾米马上就离开了房间。

Mary shouted at him and he was gonein double-quick time.
玛丽朝他大喊，他马上就跑没影了。