Dic: discount (one of its meanings as a verb)

1. VERB | If you discount an idea, fact, or theory, you consider that it is not true, not important, or not relevant (= disregard) : However, traders tended to discount the rumor.

2.

(a) To leave out of account as being untrustworthy or exaggerated; disregard: discount a rumor.

(b) To underestimate the significance or effectiveness of; minimize: took care not to discount his wife's accomplishments.

(c) To regard with doubt or disbelief.

..... Cobuild, The American Heritage