not take a proper measure of oneself;overrate one's own abilities;do sth. beyond one's ability or strength;overconfident ;

In making these promises, the company had clearly overreached itself.
这家公司作出这些承诺,显然是不自量力。
来源:《牛津高阶英汉双解词典》A tiny insect , trying to shake a mighty tree, is ludicrously ignorant of its own weakness.
蚍蜉撼大树, 可笑不自量.
来源:《现代汉英综合大词典》The people who sustain the worst losses are usually those who overreach.
不自量力者往往摔得最惨。
来源:《柯林斯高阶英汉双解学习词典》Don't apply for that job: you're in danger of overreaching yourself.
不要申请那份工作,以免有不自量力之嫌.
来源:《简明英汉词典》
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