working breakfast       
noun [ C ] uk/ˌwɜː.kɪŋ ˈbrek.fəst/ us/ˌwɝː.kɪŋ ˈbrek.fəst/
 工作早餐
a meal at the beginning of the day during which work is done or discussed
  He was having a working breakfast with some colleagues. 他正在和一些同事吃工作早餐。 
 He is known to ring political colleagues in the early hours to discuss proposals in a speech and enjoys working breakfasts. 众所周知,他会在凌晨打电话给政界同僚,讨论演讲中的提议,并喜欢吃工作早餐。 
 - More examples
 - I've got to talk to this guy over a working breakfast at my hotel first thing in the morning.
 - Hope you don't mind, this will be a working breakfast.
 - The working breakfast's great benefit is its relative informality.