What does “come alive” mean in English?

When something comes alive, it suddenly becomes interesting and full of energy — like a quiet room that comes alive when the music starts. In the clip, a speaker says a teacher “made the subject come alive,” meaning the teacher turned a boring topic into something exciting. You can also say a city comes alive at night, or a story comes alive when someone tells it well.

“Come alive” works for places (“the market comes alive on Saturdays”), for people (“she comes alive on stage”), and for subjects, as in the clip. It is stronger than just “interesting” — it says something changed from dull to exciting. In the clip: “History, predominantly modern history. That’s the main reason my history teacher is the reason why I became a teacher. She was really inspiring, and she made the subject come alive.”