fat (n.)youdaoicibaDictYouDict
"fat part of anything," mid-14c., from fat (v.). Cognate with Dutch vet, German Fett, Swedish fett, Danish fedt. As a component of animal bodies, 1530s. Figurative sense of "best or most rewarding part" is from 1560s. Expression the fat is in the fire originally meant "the plan has failed" (1560s).
flesh (v.)youdaoicibaDictYouDict
1520s, "to render (a hunting animal) eager for prey by rewarding it with flesh from a kill," with figurative extensions, from flesh (n.). Meaning "to clothe or embody with flesh," with figurative extensions, is from 1660s. Related: Fleshed; fleshing.
remunerative (adj.)youdaoicibaDictYouDict
1620s, "inclined to remunerate," from remunerate + -ive. From 1670s as "rewarding;" 1859 as "profitable." Related: Remuneratively; remunerativeness.
reward (v.)youdaoicibaDictYouDict
c. 1300 "to grant, bestow;" early 14c. "to give as compensation," from Old North French rewarder "to regard, reward" (Old French regarder) "take notice of, regard, watch over," from re-, intensive prefix (see re-), + warder "look, heed, watch," from Germanic (see warder). Originally any form of requital. A doublet of regard. Related: Rewarded; rewarding.
yielding (adj.)youdaoicibaDictYouDict
late 14c., "generous in rewarding," present participle adjective from yield (v.). From 1660s as "giving way to physical force."