[] (often used with an adverb 常与副词连用) to affect sb/sth badly严重影响（某人／某事）◆Scandals like this are knocking investor confidence.像这样的丑闻正严重影响投资者的信心。◆A decline in sales knocked profits back 67% to €7.7 million.销售量的下降使利润下降 67% 至 770 万欧元。●come ˈknocking () if sb comes knocking they speak to or visit you because they want sth主动上门◆You can't rely on existing customers to come knocking when they need something.你不能指望现有的顾客需要东西的时候会主动上门。●knock on/at sb's/the ˈdoor●knock on ˈdoors () to talk to or visit sb because you want sth from them敲门（有要求时才去和人说话或拜访人）◆Investment bankers have been knocking on our door once a month (= wanting to invest).投资银行家每月一次敲我们的门（想投资）。●ˌknock sb/sth ˈback (usually be knocked back) to have a bad effect on sb/sth; to prevent sb/sth from achieving sth or making progress对（某人／某事）有不良影响；阻碍，妨碍（取得成果或进步）◆The economy was knocked back by last year's recession.经济受到去年衰退的不良影响。 () () to reject sb/sth拒绝（某人／某事）◆They remain optimistic, although their takeover bid has been knocked back.尽管他们的收购被拒绝，他们依然保持乐观态度。●ˌknock sb ˈdown (from sth) (to sth) () to persuade sb to reduce the price of sth说服某人降价；使降价；杀价◆I managed to knock him down to $400.我终于使他将价格降到了 400 美元。➡knock-down ●ˌknock sth ˈdown (from sth) (to sth) () to reduce the price of sth降价◆They knocked down the price from €400 to €300.他们把价格从 400 欧元降到 300 欧元。➡knock-down ●ˈknock sth from sthto cause the value of sth to fall by the amount mentioned（某物的价值）下跌◆The weakness of the currency knocked $30 million from our profits.货币疲软使我们的利润下降了 3000 万元。●ˌknock ˈoff●ˌknock ˈoff sth () to stop doing sth, especially work停止某事；中断某事；（尤指）下班，收工◆Do you want to knock off early today?你今天想早点收工吗？●ˌknock ˈoff sth () to produce a product that is a cheap copy of sb else's design, often illegally（常指非法）抄袭HELP A noun or phrase must follow off, but a pronoun is placed between the verb and off.名词或短语必须放在 off 之后，但代词放在动词和 off 中间。➡knock-off ●ˌknock sth ˈoff●ˌknock sth ˈoff sthto reduce the price, value, length, etc. of sth降价；贬值；缩短◆They knocked off €50 because there was a scratch.因为有擦痕，他们将价格降了 50 欧元。◆The news knocked 13% off the company's shares.这个消息使公司股价下跌了 13%。