Mush is a thick, soft paste. ⇒ The brown mush in the fridge is some veg soup left over.
2. uncountable noun
If you describe something such as a film or book as mush, you mean that it is very sentimental. [disapproval] ⇒ Whenever famous actresses get together to make a 'woman's film' you can bet on an overload of sentimental mush.
If you mush something, you make it into a mush. [V-ed up] ⇒ ...mushed-up potato and cauliflower. [Also V n, V-ed]