Nip something in the bud
Definition 1 of 1
Pro Tip 1/3Quick Action
The phrase emphasizes the need for immediate response to prevent further issues. 
When he saw the leak, he decided to nip it in the bud and called a plumber instantly.
Pro Tip 2/3Early Stage
Use this phrase when referring to the very start of a problem or situation. 
The teacher nipped the cheating in the bud by enforcing strict exam rules from day one.
Pro Tip 3/3Potential Problems
It's best used for situations that could become more serious if not addressed quickly. 
She nipped potential disruptions in the bud by setting clear classroom expectations.