reat something in a way that shows that you think it is now less important than it was
downgrade
fail to consider or to recognise
overlook
improve the quality of something
upgrade
check that something works or happens in the way that it should
oversee
become better than something/body else
overtake
promise to do something
undertake
think or guess that something is smaller or less important than it really is
underestimate
consider something to be better than it really is
overestimate