dunk  
verb [ T ] uk/dʌŋk/ us/dʌŋk/
  (INTO LIQUID)         
  将(饼干、面包等在茶水或汤中)蘸一下,泡一下
to put a biscuit, piece of bread, etc. into a liquid such as tea, coffee, or soup for a short time before eating it
  She dunked a biscuit in her coffee. 她把饼干在咖啡里蘸了一下。 
  informal把…在液体中浸泡一会儿 
to put something into liquid for a short time
  Dunk the sponge in water every once in a while to stop it from drying out. 时常把海绵浸在水里可避免它变干。 
   (BASKETBALL)     
 US(同slam-dunk) 
to slam-dunk