Comparative form of 'fat': having more fat or body mass; thicker or fuller in appearance.
From Old English 'fætt,' originally meaning 'fattened' or 'fed.' The adjective developed from Old Germanic roots and has been used since ancient times.
Fat wasn't always seen as bad—in medieval times, 'fatter' meant you were wealthy and well-fed, which was a sign of status, so our modern fear of 'fatter' bodies is actually a pretty recent cultural flip!
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