to show that an idea, a belief, etc. is false; to show that something is not as good as people think it is แสดงให้เห็นว่าความคิดหรือความเชื่อนั้นผิด, หักล้างความคิด
Scientists quickly debunked theories that the world would end on December 21, 2012.
I can debunk all the nasty stories about him because I know him as a friend, as a nong.
It is important for me to debunk the main myths being promoted by Cambodia which may have led to confusion for many of our friends.