The act of showing something to be false (or bunkum)(noun)
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Use "debunking" in a sentence
"The problem with the next paragraph of the Panel report came from the use again of the word debunking."
"Unfortunately, as co-blogger David Kopel points out, it seems more such debunking is needed, as some are still trying to peddle the myth of an expert consensus on this issue."
"Really majii the president left no stone unturned in debunking their crap."