bloodletting            
noun uk/ˈblʌdˌlet.ɪŋ/ us/ˈblʌdˌlet̬.ɪŋ/
 [ U ] formal流血;杀戮,大屠杀 
killing and violence, especially between enemy groups involved in an argument that has existed for a long time
  ethnic bloodletting 种族大屠杀 
  [ S or U ]裁员 
the situation in which a company reduces the number of people working for it
  EWS carried out further bloodletting by sacking some senior employees. EWS公司通过解雇老职员来进一步裁员。 
  [ U ](旧时的)放血疗法 
in the past, a medical treatment in which blood was taken from a person who wasill