Etymology
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grease (n.)

"oily fat of land animals," c. 1300, from Anglo-French grece, Old French gresse, craisse "grease, fat" (Modern French graisse), from Vulgar Latin *crassia "(melted) animal fat, grease," from Latin crassus "thick, solid, fat" (source also of Spanish grasa, Italian grassa), which is of unknown origin. Grease paint, used by actors, attested from 1880. Grease monkey "mechanic" is from 1918.

grease (v.)

mid-14c., "smear, lubricate, or anoint with grease or fat," from grease (n.). Sense of "ply with bribe or protection money" is 1520s, from notion of grease the wheels "make things run smoothly" (mid-15c.). To grease (someone's) palm is from 1580s. Expression greased lightning, representing something that goes very fast, is American English, by 1832.

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Definitions of grease
1
grease (n.)
a thick fatty oil (especially one used to lubricate machinery);
Synonyms: lubricating oil
grease (n.)
the state of being covered with unclean things;
Synonyms: dirt / filth / grime / soil / stain / grunge
2
grease (v.)
lubricate with grease;
grease the wheels
From wordnet.princeton.edu