be (all) lit up like a Christmas tree
1. To be covered in or decorated with many bright lights. The bridge is all lit up like a Christmas tree for the winter. It looks so beautiful when you drive over it in the dark. He cycles at night, so he's always lit up like a Christmas tree whenever he gets on the road. Thanks to that fancy new glow collar, Spike is all lit up like a Christmas tree on our nighttime walks now.
2. To be very brightly or radiantly illuminated. Isn't the new porch light a little bright? The whole house is lit up like a Christmas tree now. A: "How am I supposed to sleep when the room's lit up like a Christmas tree?" B: "Well, I can't sleep in the dark knowing there's a bug in here!" I'm going to light some candles—there's no need for the room to be lit up like a Christmas tree for dinner.
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