due diligence - definition and synonyms

noun [uncountable] legal 

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/ˌdjuːˈdɪlɪdʒ(ə)ns/
  1. the process of carefully examining something or someone, especially before agreeing to buy it or employ them or before advising someone else to buy it or employ them
    exercise due diligence:

    It is the employer’s duty to exercise due diligence when appointing new staff.