Etymology From un- (reversive prefix) + count (“to amount”).
1
Ambitransitive To deduct from a count; discount or subtract.
Children accomplish learning how to count, and then almost immediately they have to learn how to 'uncount', that is, subtract.2017, Eugenia Cheng, Beyond Infinity:
The jar rocks and falls, allowing the mice to 'uncount' themselves from the jar. The large mouse turns out to be a rock and the snake is left hungry.2019, Sue Pope, Pablo Mayorga, Enriching Mathematics in the Primary Curriculum, page 84:
For example, the term abuse would require at least one definition for the uncount usage ‘invective, insulting language’, and another for the count usage ‘an item of invective, an insult’.2014, James Lambert, “Diachronic stability in Indian English lexis”, in World Englishes, page 118: