The word "fatter" is correct and usable in written English.
You can use it to describe someone or something that has become larger in size relative to another entity. For example, "My cat is getting fatter; she must have been sneaking treats again!".
By the time the one-day game had taken off in the Packer era, the wallets of advertisers and sponsors were fatter than ever and both booze and smokes made their play for sport.
The brass sounds fatter than ever on what is easily Faith's best song to date.
The fitter she became, the fatter I felt.
But it is wrong to suggest that Mr Osborne would have fatter coffers if he scrapped the tax altogether.
What they have seen is that privatisations have made fat cats fatter, while the poor--over half of the populace--have grown poorer.
The past 12 months have not exactly seen a burst of capital-raising by smaller firms (see chart).But bankers say the pipeline for future public offerings is as good as it has been in the past five years and getting fatter.
Demand for health services will rise as Obamacare expands insurance and Americans grow older, fatter and sicker.
All this is no doubt true, but it does not explain why Americans are fatter than people in other rich countries, nor why they appear to have stopped getting fatter.No to nanniesKathleen Sebelius, the health secretary, says that "fighting obesity is at the heart" of health reform.
Assembling giant jets may be more glamorous than making hydraulics and bits of electronic kit, but the partsmakers' margins are already fatter, in many cases, than those of the planemakers.
This, it is argued, promises fatter profits in the upturn and therefore justifies today's lofty share prices.Unfortunately, even if the recession is over and even if productivity growth remains impressive, both of which are uncertain, the rise in profits over coming years is likely to disappoint investors.
