mash (something) with (something)
1. To use something to crush or smash something else into dust or paste. Mash the avocado with the mortar and pestle before you add the tomato, onion, and lime juice.
2. To crush or smash multiple ingredients together to form a mixture. Make sure you mash the tomatoes with a teaspoon of sugar to cut through their acidity.
3. To combine different elements in a clumsy, forceful manner. The director mashes a gross-out comedy with a vampire horror film to create something quite unlike anything else you'll see this year—for better or worse.
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.
mash
in. to neck and pet. (Collegiate.) Who are those two mashing in the corner?