1. 指出…的错误;揭穿…的吹嘘（或虚假）
If you debunk a widely held belief, you show that it is false. If you debunk something that is widely admired, you show that it is not as good as people think it is.

1. expose while ridiculing
especially of pretentious or false claims and ideas

e.g. The physicist debunked the psychic's claims

Synonym: expose