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o‧ver‧es‧ti‧mate1
[transitive]
[transitive]1 to think something is better, more important etc than it really is [≠ underestimate]: 
He tends to overestimate his own abilities.
He tends to overestimate his own abilities.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.
Most patients overestimated how long they had had to wait to see a doctor.
