verb · to set oneself against someone or to be deliberately difficult and disobliging

我不知道他为什么总是跟我较劲，处处找我麻烦。

verb · to match one's strength with others or to be in competition

这两个企业为了市场份额一直在暗中较劲。

verb · to make a special effort or put extra strength into a task

为了搬动这块沉重的大石头，他浑身都在较劲。