due diligence

[doo dil-i-juh ns, dyoo]

noun Law, Business.

reasonable care and caution exercised by a person who is buying, selling, giving professional advice, etc., especially as required by law to protect against incurring liability: The court said there was due diligence on the part of the plaintiff.
the process of gathering or disclosing relevant and reliable information about a prospective sale, purchase, contract, etc.: You should perform due diligence on a company before investing.

Origin of due diligence

1785–90 (1450–1500 in the sense “requisite effort”)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019