Longman Dictionary of Contemporary English homepage

overestimate

1 verb
     
o‧ver‧es‧ti‧mate1 [transitive]
1 to think something is better, more important etc than it really is [≠ underestimate]:
He tends to overestimate his own abilities.
The importance of training in health and safety cannot be overestimated (=is extremely important).
2 to guess an amount or value that is too high [≠ underestimate]:
Most patients overestimated how long they had had to wait to see a doctor.

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