(I've been) keeping cool
I've been avoiding becoming overly hot, as in hot weather. A: "How have you been during this brutal heat wave?" B: "Oh, keeping cool, thanks to the air conditioning in the office." Yeah, we have a pool, so I've been keeping cool. I wish I could say I've been keeping cool on these 90 degree days, but I work outside, and shade is hard to come by.
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