Made fat; fattened or fed well; usually describing an animal prepared for slaughter or a religious feast.
Past participle and adjective form of the verb 'fat' (to fatten), from Old English 'fættan'; the famous 'fatted calf' comes from Biblical language.
The 'fatted calf' became such a powerful symbol in English literature and Biblical allusions that it represents extravagant celebration—mentioning it immediately evokes feasts and great rejoicing.
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