lose reason

lose one's reason

Fig. to lose one's power of reasoning, possibly in anger. I was so confused that I almost lost my reason. Bob seems to have lost his reason when he struck John.
See also: lose, reason
References in periodicals archive ?
These disgruntled groups will lose reason [to fight] if there is good implementation of the peace process,"A Hataman said.
Commenting on a statement by French President Francois Hollande about possible military intervention in Syria, Denisov said "One should not lose reason and actual vision of what is happening in Syria," adding that the talk about any foreign intervention is a reflection of political emotions more than analysis and calculation.
The Pig will not lose reasons to celebrate, which means the Pig is going to have a very busy year--socializing, partying, etc.