relinquish          
verb [ T ]  formal uk/rɪˈlɪŋ.kwɪʃ/ us/rɪˈlɪŋ.kwɪʃ/
 放弃;拒绝
to give up something such as a responsibility or claim
  He has relinquished his claim to the throne. 他放弃了继承王位的要求。 
 She relinquished control of the family investments to her son. 她把家庭投资的掌控权移交给了儿子。 
  (不情愿地)松开,放开,交出,让予
to unwillingly stop holding or keeping something
  She relinquished her hold/grip on the steering wheel. 她松开了握着方向盘的手。