Grammar fix
go mouldy
grow mould
To have mould grow on food, often as green or white patches.
collocation
How oftenCommon
LevelB2
Used inSpeech & writing
Hear it in context
Notice where the phrase sounds natural.
The last two slices of bread have gone mouldy.
I've started freezing half the bread I buy because I live alone and it often goes mouldy before I finish the loaf.
Fix the pattern
One small grammar move makes it sound right.
Not: The bread has gone mould.
Say: The bread has gone mouldy.
'Mould' is the substance; use the adjective 'mouldy' after 'go' to describe the food.
Don't confuse it
Other ways to say it
Food is no longer good to eat
Which foodAny foodOne food
go badAny food or drink, UK and US. The safe default.be offHow British people say it at the fridge: "This milk is off."go offThe usual British word: milk, meat, fish, leftovers. 'The milk's gone off.'
go mouldyYou're here · When you can see mould: bread, cheese, fruit. US spelling: moldy.
go staleBread, cake, biscuits, crisps: dry or soft, not dangerous.