make a mess/hash of something/of doing something

make a mess of something

Fig. to mess something up; to ruin something. Give it a try, but don't make a mess of it. Jerry made a mess of the kitchen.
See also: make, mess, of

make a hash of

Also, make a mess of. Ruin or spoil something, as in They've made a hash of their financial affairs, or She thought he'd make a mess of the garden. The first term, first recorded in 1833, uses hash in the sense of "a jumble of mangled fragments"; the variant, using mess in the sense of "a muddle" or "a state of confusion," was first recorded in 1862.
See also: hash, make, of

make a hash of something

If you make a hash of a job or task, you do it very badly. The Government made a total hash of things and wasted a small fortune. She fumbled with the trolley and made a hash of stacking the food trays.
See also: hash, make, of, something

make a hash of

make a mess of; bungle. informal
Hash comes from the French verb hacher meaning ‘chop up small’. A hash is a dish of cooked meat cut into small pieces and recooked with gravy; from this comes the derogatory sense of hash meaning ‘a jumble of incongruous elements; a mess’.
See also: hash, make, of

make a ˈmess/ˈhash of something/of doing something

(informal) do something very badly: We tried making some wine, but we made a mess of it (= it did not taste good).I made a complete hash of the whole exam.
See also: hash, make, mess, of, something