1. To redden in the face (blush), due to embarrassment, anger, or romantic stimulation. She went red when her crush came up and talked to her. He hates the president so much that he goes completely red if you bring up the recent election.

2. Of skin, to become burned by the sun. I forgot to wear a wide-brimmed hat on the hike, and my whole head went red. If I don't put on sunscreen before a day at the beach, I go completely red.

3. Of a US state, county, district, or Congressional seat, to have the majority of people vote for a Republican candidate in a given election. With Ohio having gone red, the Republicans look poised to reclaim the presidency.