What are the opposite words for overapproximate?

Overapproximate means to estimate or represent as greater than the actual value or size. Its antonyms could be 'underestimate' which means to estimate or represent as less than the actual value or size or 'exact' which means precisely accurate or correct in every detail. 'Understate' could also be considered an antonym for 'overapproximate' which means to present or express in a restrained way that fails to convey the full import of the subject. In technical terms, 'underapproximate' is also considered as an antonym for the word 'overapproximate' in mathematical and computer science fields which means to estimate or represent as less than the actual value or size, with a known margin of error or uncertainty.

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Antonym of the day

doth to a turn
Antonyms:
abstain, avoid, bear.