overestimate
v[Tn]
estimate (sth) to be bigger, higher, better, etc than it is 过高估计(某事物)
I overestimated the amount of milk we´d need for the weekend. 我过高估计了我们周末的用奶量.
I overestimated his abilities he´s finding the job very difficult. 我过高估计了他的能力--现在他觉得工作非常困难. Cf 参看 underestimate.