Usage patterns
〈物〉の脂を取るto remove the fat from something
I trimmed the fat off the meat before grilling it.
脂が浮くfor fat to float (on the surface of a liquid)
Fat is floating on the surface of the soup.
脂で汚れるto get stained or greasy with fat
My shirt got stained with grease.
Expressions
脂が乗るget into the swing of things; hit one's stride · put on fat (for winter); become plump and tasty