HELP The forms shorter and shortest are not usually used in these meanings.shorter 和 shortest 通常不用于下列词义。if you go short of or run short of sth, you do not have enough of it缺乏；短缺◆We're running short of stock so we'd better put in an order.库存不多了，因此我们最好订一批货。 (Finance 金融; Stock Exchange 证券交易(所)) if you sell sth short or go short (on sth), you sell shares, currencies, etc. that you do not yet own, hoping that their price will fall and you will make a profit by buying them later at a lower price（股票、货币等）卖空地◆Investors who went short on the stock made big profits when the share price fell.股价下跌时，卖空股票的投资者赚了大钱。before the time expected or arranged过早地（中止）◆I'm afraid I'm going to have to stop you short there, as time is running out.时间不够了，恐怕我得就此打断你了。  ➡  idiom at fall verb, run verb