Yes, caith means “wear”, but bí … ar also means “wear” with respect to clothing. The FGB describes the latter as “Of anything covering or enclosing, attached to or supported by body or thing” — see its definition and examples for ar² II. 1. (e) here, and the examples for definition 4 of “wear” in the NEID here.
The speaker is properly pronouncing the slender r in air. That sound, /ɾʲ/, a palatalized alveolar tap, is not found in English, although the unpalatalized version is found in North American English as the “tt” in words such as “batter” (which is often perceived as “badder” in other English dialects).
i'd like an explanation : if" ta broga air " means " he has shoes on " why is Ta... air given as HE MUST in a previous sentence in this lesson ( he must swim.) WHAT IS THE REAL MEANING OF "AIR" is it a verb meaning TO HAVE OR TO MUST) (ITO HAVE TO ?) i was tempted to translate this as HE MUST HAVE SHOES but I didn't like it and then i saw DUO's translation which confuses me. . Thanks for you help.
Nahuatl1939 I think you're getting the words in the wrong order. Tá bróga air - He has shoes on/Shoes are on him. Tá air rith - he has to/must run.
In Hiberno-English - the dialect of English spoken in Ireland - people often say, 'It is on him to X' meaning, 'He has to/must X'.
I hope this helps.