Balk means to suddenly stop and refuse to go forward, like a horse that plants its hooves and won't budge when asked to cross a stream. When you balk at something, you hesitate or resist because it seems too difficult, scary, or wrong.

A student might balk at reading a thick book that looks intimidating, or you might balk at jumping off the high dive at the pool. Parents sometimes balk at the price of a fancy toy. The word captures that moment of pulling back, of saying “wait, I'm not sure about this.”

In baseball, a balk is a specific illegal motion by the pitcher, usually when they start to pitch but then stop suddenly, which confuses the runners and results in a penalty.

The word often suggests a natural, instinctive reaction rather than a carefully thought-out decision. When something makes you balk, your gut tells you to pause or refuse. Sometimes balking is wise, like when someone dares you to do something that might get you hurt. Other times, pushing past that hesitation helps you grow and try new things.