When we need to hurry up and do something as fast as we can, we often use the phrase "all haste". However, there are several synonyms that can replace this phrase and add more variety to our language. Some of these synonyms include "with all speed", "at full tilt", "at top speed", "in a rush", "frantic", "in a hurry", "as fast as possible", and "at breakneck speed". Each of these phrases convey the sense of urgency and promptness required in certain situations. Using synonyms for "all haste" can help you avoid repetition in your writing and make it more engaging and interesting to read.