regard (sth) as unimportant or untrue; ignore (sb/sth) 不重视, 不相信, 不理会（某人[某事物]）: You can discount what Jack said: he's a dreadful liar. 杰克说的话你不必当真, 他可是个说谎大王. 
(commerce 商) buy or sell (a bill of exchange) for less than it will be worth when due 将（票据）贴现.