grease

nouns

a thick fatty oil (especially one used to lubricate machinery)
is derived from
the state of being covered with unclean things

verbs

lubricate with grease
"grease the wheels"
is a type of (narrower)
provide with a covering or cause to be covered
"cover her face with a handkerchief"; "cover the child with a blanket"; "cover the grave with flowers"