cud       
noun [ U ] uk/kʌd/ us/kʌd/
 反刍的食物
food that has been eaten by an animal with more than one stomach, such as a cow, and that comes back into the animal's mouth to be chewed again before going into the second stomach
 UK a cow chewing the cud 反刍的奶牛 
US a cow chewing cud 反刍的奶牛 
 Idioms      
chew the cudidiom UK informal (US chew your cud) 深思,反复思考
to think slowly and carefully about something
  He sat for a moment chewing the cud before he spoke. 他坐着沉思了片刻才开口说话。 
 chew your cudidiom US informal (UK chew the cud) 深思,反复思考
to think slowly and carefully about something
  He sat for a moment chewing his cud before he spoke. 他坐着沉思了片刻才开口说话。