reinsure Syllabification: (re·in·sure)Pronunciation: /ˌrē-inˈSHo͝or/Definition of reinsure verb [with object] (of an insurer) transfer (all or part of a risk) to another insurer to provide protection against the risk of the first insurance. Derivatives reinsurancePronunciation: /-ˈSHo͝orəns/ noun reinsurer noun reinsure in other Oxford dictionaries Definition of reinsure in the British & World English dictionary