To press something down or together so it becomes flat or small.
Smoosh can make people think of making things soft or squishy.
Examples:
I smoosh the playdough with my hands.
She likes to smoosh the bread before she eats it.
The cat smooshes itself into the box.
Don't smoosh the cake, it's for the party!
I accidentally smooshed my sandwich in my bag.
He smooshes the clay into a ball and then makes a cup.