noun
a dish of cooked meat cut into small pieces and recooked, usually with potatoes
verb
to make a mess of something, to ruin or botch
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The chef accidentally hashed up the recipe by adding too much salt.
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I totally hashed up my presentation in front of the whole class.
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Don't hash up the plan by forgetting to bring the key.
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She hashed up her relationship by constantly lying to her partner.