slick - definition and synonyms

verb [transitive] [often passive] 

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/slɪk/
present tense
I/you/we/theyslick
he/she/itslicks
present participleslicking
past tenseslicked
past participleslicked
  1. to make something, especially hair, flat and shiny by putting water or oil on it

    His long white hair was slicked back with gel.