noun, noun or participle which takes 'suru', intransitive verb
aiming too high; overreaching; unrealistic aspirations
Used when someone sets goals or desires beyond their ability, status, or means. Often carries a negative or cautionary tone.
高望みをすると失敗するかもしれない。
If you aim too high, you might fail.
彼はいつも高望みして、結局何
He always overreaches and ends up with nothing.