/ mʌʃ; NAmE / noun
1.
[ U , sing. ] (usually disapproving ) a soft thick mass or mixture :
The vegetables had turned to mush.
His insides suddenly felt like mush.
2.
[ U ] ( NAmE ) a type of thick porridge made from corn ( maize )
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WORD ORIGIN
late 17th cent. (referring to a thick porridge): apparently a variant of mash .