noun The replacement of a substance at a level less than what makes up for whichever specific deficiency or loss is present.
They need to watch out for underreplacement of magnesium because an adverse effect of the medication is impaired magnesium metabolism.
noun The replacement of equipment, supplies, or staffing at a level less than what makes up for baseline attrition, either appropriately (e.g., because of reduced demand) or inappropriately (e.g., because of budget constraints or underinvestment). .mw-parser-output .defdate{font-size:smaller}
The company has pledged that its AI use will not produce any layoffs; one way that headcount reduction may nonetheless occur will be if underreplacement of workers lost to normal attrition is pursued.