[in sing.]a strong and adverse reaction by a large number of people, especially to a social or political development (尤指人们对社会或政治运动的)强烈反对 a public backlash against racism. 公众对种族主义的强烈反对。
[mass noun]recoil arising between parts of a mechanism (机械的)反冲;反作用 ■degree of play between parts of a mechanism (机械的)轮齿隙