yellow grease en · NOUN
Pronunciation
- (Australia) audio
Meanings
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(idiomatic, uncountable) Used vegetable oil purposed for use as biodiesel.
Using waste oil can be much less problematic, but in the US, waste oil is sold by rendering companies as yellow grease, and to a certain extent yellow grease is a substitute for fresh oil.
2008, Forest Gregg, Christopher Goodwin, SVO: powering your vehicle with straight vegetable oil, page 4: