[] the lowest or worst level of sth 底层；低谷◆You have to be prepared to start at the bottom in the company and work your way up. 你必须有从公司的基层做起的思想准备，然後再努力向上。◆Analysts believe this is the bottom of the cycle for mobile phone makers. 分析员相信这是手机制造商的低谷。◆The decline in demand for the products has now hit bottom. 产品需求下降现在已达到最低点。
[] the lowest part of sth 底部；最下部分◆A message should appear at the bottom of the screen. 应该有一条信息出现在屏幕的最下端。
●the ˌbottom drops/falls ˈout of sthpeople stop buying or using the products of a particular industry （某行业）产品滞销◆The bottom has dropped out of the travel market. 旅游市场已出现萧条的情况。●from the ˌbottom ˈuprelying on the ideas and support of the people who have lower positions in an organization 自下而上（依靠机构中职位较低者的想法和支持）◆She believes that authority comes from the bottom up, not the top down. 她认为权力是自下而上而不是自上而下产生的。OPPfrom the top down ➡bottom-up ➡ idiom at touch false bottom race to the bottom rock bottom
