Undergrading

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Undergrading

In numismatics, the act or practice of appraising a coin for less than it is actually worth. This is an unethical practice, often conducted by persons who are trying to buy a valuable coin without paying full price.
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References in periodicals archive ?
The bottom left-hand corner (in bold) indicates 'over-grading' according to the standard, and the top right-hand corner (in italics) indicates 'under-grading' of referable images.
The leading diagonal (hold italics) indicates exact agreement between the standard and the graders, the bottom left-hand corner (bold) indicates 'over-grading' according to the standard, and the top right-hand corner (italics) indicates 'under-grading' of referable images.
However, biopsy may miss or under-grade prostate cancer: false-negative rates of the first sextant biopsy approach 17%, upgrading on subsequent biopsy approaches 20% and under-grading rates are 30% to 50%.[sup.1]-[sup.5]