From Longman Business Dictionaryunder-investmentˌunder-inˈvestment (also underinvestment) noun [uncountable] FINANCEECONOMICSthe act of investing less money in something than is neededWe’ve heard complaints of under-investment in railways, and over-reliance on road building. —under-invest verb [intransitive]Some small firms under-invest in long-term projects which take many years before they yield a positive return. → compare over-investment