To underestimate oneself

• 妄自菲薄

To underestimate oneself的用法和样例：

例句

1. All the staff would never underestimate our own capabilities, since the stick is not necessarily weaker than the needlepoint.
   我们高峰人从不因为自身之小而妄自菲薄，因为木棒未必强于针尖。