Verb
air up (third-person singular simple present airs up, present participle airing up, simple past and past participle aired up)
(transitive) To inflate (something, such as a tire or air mattress)
We need to air up the tire if we want to continue.
Our air up here is good for the disease - I mean good against the disease,... but it is also good for the disease. Thomas Mann
The air up there in the clouds is very pure and fine, bracing and delicious. And why shouldn't it be?--it is the same the angels breathe. Mark Twain
I wonder if it's like this for mountain climbers, he thought. You climb bigger and bigger mountains and you know that one day one of them is going to be just that bit too steep. But you go on doing it, because it's so-o good when you breathe the air up there. And you know you'll die falling. Terry Pratchett