1. to estimate or evaluate something as being greater in value, importance, or capability than it actually is
Don't overestimate your abilities; be realistic about what you can accomplish.
Não superestime suas habilidades; seja realista sobre o que você pode realizar.
2. to assign too high a value or importance to someone or something
The critic tends to overestimate the quality of mainstream films.
O crítico tende a superestimar a qualidade dos filmes mainstream.