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tr. & intr.v. slick·ened, slick·en·ing, slick·ens
To make or become slick.

slick′en·er n.
References in periodicals archive ?
The slickens (clay-like deposits of mine waste) are gone.
The highways also suffer because the first storm loosens up the highway grime - the oil and diesel fuel that slickens roadways and adds to the slip-and-slide effect, officials said.
On deck shooting into the underside of heaven the mast slickens with oil, hardened grease.