3 Sentences With "letting air out"

How to use letting air out in a sentence? Find typical usage patterns (collocations)/phrases/context for "letting air out" and check conjugation/comparative form for "letting air out". Mastering all the usages of "letting air out" from sentence examples published by news publications.

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Instead I stood next to the door, letting air out of my chest one miniature puff at a time. from The New York Times
When the shark feels threatened, it will bend its body into a U–shape, grab its tail fin with its mouth, and suck in water. Doing so causes the shark to enlarge in diameter and makes it much harder for predators to bite or dislodge. The swell shark is capable of swelling by using water or air, which is stored in the stomach until released. When letting air out, the swell shark makes a dog-like bark.
The hydraulis is the name of a Greek instrument created by Ctesibius of Alexandria. The hydraulis has a reservoir of air which is inserted into a cistern of water. The air is pushed into the reservoir with hand pumps, and exits the reservoir as pressurized air to blow through the pipes. The reservoir is open on the bottom, allowing water to maintain the pressure on the air as the air supply fluctuates from either the pumps pushing more air in, or the pipes letting air out.