adjective
slicker; -est
[also more ~; most ~]
very smooth and slippery
clever in usually a dishonest or deceptive way
skillful and clever
very good :of the highest quality
verb
slicks; slicked; slicking
[+ obj] :to make (something) smooth and slippery
slick back/down
[phrasal verb]
slick back/down (hair) or slick (hair) back/down :to pull (hair) back and make it look smooth or shiny by using water or some wet substance (such as hair gel)
noun
plural slicks
[count] a thin layer of liquid that makes a surface very slippery especially; :oil slick
a smooth tire that is used in car racing