1 reduce sth (from sth) (to sth);reduce sth (by sth) to make sth less or smaller in quantity, price, size, etc 减少，减低，减缩（数量、价钱、尺寸等）: The sign said ‘Reduce speed now’. 标志上写着“开始减速”。 [OPP] increase 反义词为increase

2 reduce sb/sth (from sth) to sth (often passive 常用于被动语态) to force sb/sth into a particular state or condition, usually a bad one 使处于某种（不佳的）状态: One of the older boys reduced the small child to tears. 其中一个年纪较大的男孩把那个小孩弄哭了。