It's typically not good when light bulbs go off (unless you're trying to sleep or save on electricity costs), and it becomes quite amusing when you hear this metaphorical expression used incorrectly by a teacher describing a learning moment in her classroom. No, this teacher wasn't trying to communicate that her students were in a temporary state of intellectual darkness. She really meant to say that a light bulb had gone ON. (Gotta love those moments as a teacher!)
She may have mixed this idea with an auditory "image" of a bell or an alarm going OFF (which really doesn't make sense because the sound is actually ON, though we would never say "an alarm going on").
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