underreporting

/AH1 N D ER0 R IH0 P AO1 R T IH0 NG/
verb
  1. 1

    To report a number falsely, making it smaller than it ought to be, especially to do so intentionally

  2. 2

    As a group, to report something less frequently than it actually occurs

    โ€œWomen tend to underreport rape.โ€

noun
  1. 1

    The act, or the result of insufficiently reporting

Source: https://en.wiktionary.org/wiki/underreport, https://en.wiktionary.org/wiki/underreporting