Closing the border would tighten the screws on the terrorists.关闭边境将使恐怖分子受到更为严厉的打击。We need to tighten the screws on people who've been evading the tax.我们必须对那些一直逃税的人施压。The government has started to tighten the screws on illegal share dealers.政府开始打压不法券商。