Anapneo is the incantation for a spell that clears the target’s breathing airway if blocked.
References from the canon
Slughorn cast this on Marcus Belby when the latter began to choke after swallowing too fast while attempting to respond to a question (HBP7).
"anapneo" Gr. "breathe"
This is the Wizarding equivalent of the Heimlich maneuver. Slughorn's calm response to Belby's emergency is in stark contrast to Slughorn's paralyzed lack of action when Ron was poisoned.
From the Web
"Anapneo" from Harry Potter Wiki