How “trasna” works
The noun after trasna goes into the genitive, the same way it does after a noun: Shiúlamar trasna na habhann.
For across with a pronoun say anonn (over there) or trasna with a noun; trasna air is heard but the noun form is the one to learn.
“Trasna” in a sentence
Other compound prepositions
Trasna in Irish: the questions people ask
What does trasna mean in Irish?
trasna means across: Shiúlamar trasna na habhann. We walked across the river.
Does trasna take the genitive?
Yes. The noun after trasna is in the genitive case: Shiúlamar trasna na habhann. The noun with the article is an abhainn, and after trasna it becomes na habhann.
Anything else about trasna?
For across with a pronoun say anonn (over there) or trasna with a noun; trasna air is heard but the noun form is the one to learn.