Longman Dictionary of Contemporary English homepage

Sense: 1,3
Date: 1600-1700
Origin: HASH2
Sense: 2
Date: 1900-2000
Origin: hashish
Sense: 4
Date: 1900-2000
Origin: Probably from hatching

hash

1 noun
     
Related topics: Food Dish, Drug Culture
hash1
1

make a hash of something

informal to do something very badly:
I made a real hash of my exams.
2 [uncountable] informalMDD hashish
3 [uncountable and countable]DFF a dish made with cooked meat and potatoes:
4 [uncountable and countable] British English the symbol #
Definition from the Longman Dictionary of Contemporary English
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