Yesterday topped 38 degrees Celsius/100 degrees Fahrenheit and today was forecast to be similar.* As I left this morning, I said to my wife ‘Stay cool’ (in the temperature sense). She said ‘What does that mean?”. I said ‘It means – stay – cool. Don’t get too hot.’
I don’t know about anyone else, but I would never tell anyone to stay cold. Correspondingly, in winter, we would tell people to stay warm, not stay hot.
*And it was. As I type this mid-evening, a cool change has blown in, but my house is still very hot. I’ve opened all the doors and windows, but it hasn’t had much effect yet.
Never Pure and Rarely Simple 