In a jiffy is an idiom that means 'very QUICKLY' or 'in a short amount of time'. The crossword solutions for this term are ANON (4 letters), PRESTO (6 letters), and SOON (4 letters). ANON is an abbreviation of the phrase 'ANON and ever', which means 'IMMEDIATELY'. PRESTO is derived from the Italian word 'PRESTO', which also means 'QUICKLY'. SOON is an adverb that means 'in a short amount of time'. All three words can be used to describe the same concept of doing something in a jiffy.