The windpipe is the tube carrying air down to the lungs. Blocked windpipe, down the windpipe, the windpipe closed.
The medical word is trachea, and it sits in front of the tube to the stomach — which is why food going down the wrong way means it has gone into the windpipe. The rings of cartilage round it stop it collapsing, and they are open at the back so the food tube can bulge.
1nounwindpipeThe tube carrying air down to the lungs.
“A piece of apple went down his windpipe, and he started choking.”
windpipe is a tube.
Wind plus pipe, recorded from the 1520s. Wind here means air or breath.
From wind + pipe. 1520s.
Etymology from Wiktionary, CC BY-SA