Stick to your guns
Definition 1 of 1
Pro Tip 1/3Resolve Display
Emphasizes unwavering commitment to a choice, especially in adversity. 
Despite the criticism, she stuck to her guns and led the project to success.
Pro Tip 2/3Social Pressure
Often used when someone resists changing their stance despite others trying to influence them. 
The committee wanted to cut funds, but he stuck to his guns and secured the budget.
Pro Tip 3/3Emotional Strength
Implies emotional strength or courage in maintaining one's position. 
Her friends laughed at her business idea, but she stuck to her guns.