Mashing means crushing something into a soft mass, like when you mash potatoes. It can also mean mixing ingredients together, like when you mash fruit to make juice.
Mashing can feel like hard work, but it can also feel satisfying when you see the result. Mashing can also feel like making something new and tasty.
Examples:
I am mashing the potatoes for dinner.
She is mashing the bananas to make a smoothie.
They are mashing the grapes to make wine.
We are mashing the avocados for guacamole.
Mashing the berries makes the juice taste better.
Stop mashing the playdough into the carpet!