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Phrase(s): mash something with something
1. to use something to mash something up. • Vernon mashed the potatoes with a spoon because he couldn’t find the masher. • Gerald used the heel of his shoe to mash the wasp. 2. to combine ingredients while mashing. • Mash the turnips with the butter. • She mashed the potatoes with sour cream, cream cheese, and a little garlic salt.
McGrawhill's American Idioms And Phrasal Verbs