To galvanize someone means to shock them into sudden action or fill them with urgent energy. Picture a fire alarm going off during class: everyone who was daydreaming or slouching suddenly snaps to attention and moves quickly. That jolt of energy that transforms lazy into lively is what it means to galvanize.

Scientists discovered they could use electricity to make muscles move. Today, we use galvanize more broadly: a coach's halftime speech might galvanize a losing team to fight harder in the second half. A powerful book about pollution might galvanize readers to clean up their local park. When something galvanizes you, it sparks you into motion.

The key is that galvanize suggests sudden, energetic action rather than gradual motivation. You might be slowly convinced to join the school play over several weeks, but a friend's exciting description of opening night could galvanize you to sign up immediately. Something that galvanizes electrifies you into action.

Galvanization can also refer to the industrial process of coating steel with a thin layer of zinc to protect it from rust.