Plural of hatful; multiple amounts that could each fill a hat.
Standard English plural formed by adding '-s' to 'hatful.' Both 'hatfuls' and 'hats full' are grammatically acceptable plurals, though 'hatfuls' is more common in formal usage.
English pluralization can be tricky: you can say 'hatfuls' or 'hats full,' just like 'cupfuls' or 'cups full,' but the meaning stays the same—multiple hat-sized portions. Most people intuitively use 'hatfuls' as the singular plural form.
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