tallow -
To cause to have a large quantity of tallow; to fatten.
Wikipedia
Tallow is a rendered form of beef or mutton fat, processed from suet. It is solid at room temperature. Unlike suet, tallow can be stored for extended periods without the need for refrigeration to prevent decomposition, provided it is kept in an airtight container to prevent oxidation.
OmegaWiki Dictionary
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tallow A hard animal fat obtained from suet etc.; used to make candles, soap and lubricants.