Doublequick time is an idiom used to describe something that is done quickly or at an accelerated pace. There are many synonyms that can be used to replace this expression and convey the same sense of urgency or rapid action. Some examples include haste, hurry, swift, rapid, brisk, fast, expeditious, and accelerated. Other synonyms worth considering are lightning-fast, immediate, prompt, agile, lively, and fleet. All of these words can help to convey a sense of urgency and speed, making them useful tools for writers, speakers, and communicators who want to describe something that has been done quickly with emphasis and impact.