不自量

不自量(力) [bù zì liàng]

1. ■ not take a proper measure of oneself; overrate one's own abilities; do sth. beyond one's ability or strength; overconfident; be unaware of one's own limitations [impotence; weaknesses]; go beyond one's depth; kick against the pricks; not to estimate properly one's own power; not to know one's own limits; overrate oneself; put a quart into a pint pot; undertake what is beyond one's power:

蚍蜉撼大树， 可笑不自量 ridiculously overrate oneself like an ant trying to topple a giant tree