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Elementary Dictionary        

mess up

 
See:
mess
part of speech: phrase
definition 1: When you mess up something, you make it dirty or not neat.
I messed up my backpack when I dropped it in a mud puddle.Marcy's cat jumped on the desk and messed up the papers on it.My sister and her friends messed up the kitchen making cookies.
definition 2: To "mess up" means to ruin or cause something to go wrong with something. If a snowstorm messes up your plan to go to a party, it ruins or causes a problem for your plan. If you mess up your chance to do something, you ruin your chance. You do something that causes you to lose that chance.
David messed up his magic trick when he forgot one step.Luis was really upset after he messed up a catch and the other team scored.The rain messed up our plans to go to the beach, so we're going to a museum instead.