“自不量力”，亦作“自不量力”，意思是自己不估量自己的才能，指过高地估量自己的力气（overestimate one's own strength or ability），与英语谚语“bite off more than one can chew”意思附近，表明“to take (on) more than one can deal with; to be overconfident”。
例句：
我本应该当心，可是我自不量力。下来的时分我简直当即失掉操控，成果撞到一棵树上受伤了。
Instead of being cautious, I bit off more than I could chew. On my way down, I lost control almost immediately and slammed into a tree and got injured.
你得当心，不要自不量力。
Be careful you don't bite off more than you can chew.
