Past tense of guesstimate; an approximation or estimate made without precise measurements.
Regular past tense formation of the portmanteau 'guesstimate' by adding '-ed.' The verb accepts standard English inflections despite its blended origin.
Even though 'guesstimate' is a recent coinage, it immediately followed standard English verb conjugation patterns—showing that speakers instinctively know and apply the rules of English grammar even to brand-new words.
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