He is off his rocker if he thinks he can win.
he's off his rocker
idiomHe's crazy
Origin
disputed originLate 19th-century slang; usually explained by the image of someone falling off their rocking chair.
The neighbor says he wants to build a spaceship in his backyard, so everyone thinks he's off his rocker.
The investors whispered that the CEO was off his rocker after he proposed selling their most profitable division to fund a project that had no clear market value.
Last updated June 7, 2026