She seemed to lose air and all thought of breathing.

She gasped, trying not to lose too much air in talking.

Once away from them, he lost his air of lightness.

We began to lose air, and the inside locks failed to close immediately.

It was losing air, and she let them all out.

His new bubble of hope hadn't yet burst, but it was quickly losing air.

"We will lose all our air if we open the door."

Also worth mentioning is the fact that tires simply lose air over time.

He became famous while never losing his air of notoriety.

But this year the battle over capital punishment has lost its ceremonial air.