over- + calculate
overcalculate (third-person singular simple present overcalculates, present participle overcalculating, simple past and past participle overcalculated)
- To calculate as being greater than is actually the case
1822, John Gibson Lockhart, Some Passages in the Life of Mr. Adam Blair, Chapter XI, page 135:
- Meanwhile, Mr. Blair began, as anxious people will do, to overcalculate the lapse of time.