What is the meaning of the word "pant"?

Definitions:

a short labored intake of breath with the mouth open noun
- The dogs' pants interrupted their drooling.
the noise made by a short puff of steam, as from an engine noun
- The pant of the train was loud.
to breathe noisily, as when one is exhausted verb
- The runners reached the finish line, panting heavily.
to utter while panting, as if out of breath verb
- After finishing, the athletes panted a congratulations to the other competitors.
usually in the plural; a garment extending from the waist to the knee or ankle, covering each leg separately noun
- My pants matched my vest.