1 [singular, uncountable]DF
an unpleasant soft substance, especially food, which is partly liquid and partly solid:
The boiled vegetables had turned to mush.
She trudged through the mush of fallen leaves.
if your brains, heart etc turn to mush, you cannot think clearly or sensibly:
If you watch too much TV, your brains will turn to mush.
3 [uncountable] American EnglishDFF
a thick porridge made from cornmeal
a book, film etc that is about love and is sentimental:
poetry and mush like that