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Use "overestimating" in a sentence
"They have erred also in overestimating the willingness of other people to fight for themselves, or for their freedom."
"Neocons have erred in overestimating the U.S. public’s willingness to engage in long struggles on behalf of other people."
"In investigating the California rate filing, that state's Department of Insurance found mathematical mistakes, such as overestimating future medical costs and double-counting the effect of its policyholders aging, according to insurance commissioner Steve Poizner, a Republican candidate for governor."