dumbbell  
noun [ C ] uk/ˈdʌm.bel/ us/ˈdʌm.bel/
  (WEIGHT)     
  哑铃
a short bar with a weight on each end that you lift up and down to make your arm and shoulder muscles stronger
 Compare: barbell
  (PERSON)      
 US蠢人,傻瓜 
a stupid or silly person
 Synonym: dummy (STUPID PERSON)