sleek·en | \ ˈslē-kən 
\
\sleekened; sleekening\ ˈslē-kə-niŋ , ˈslēk-niŋ \
, ˈslēk-niŋ \Definition of sleeken
: to make sleek
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Time Traveler for sleeken
The first known use of sleeken was in 1621
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