(all) lit up like a Christmas tree
1. Covered in or decorated with many bright lights. They always have the bridge all lit up like a Christmas tree for the winter. It looks so beautiful when you drive over it in the dark. If you want to cycle at night, then make sure you're lit up like a Christmas tree before you get 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. 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 you have the room all lit up like a Christmas tree?" B: "Well, I can't sleep in the dark knowing there's a bug in here!" Turn off the overhead light, will you? 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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