Excuse me, may I pass?
pas-SA-re — stress on second syllable. Short, clear phrase.
When you need to get past someone blocking the aisle or exit.
'Posso passare?' (may I pass?) is a gentle request to move. 'Passare' means to pass, cross, or go through. Very simple and universally understood. The alternative is just 'permesso' (permission/excuse me) which is even shorter and very natural.
Permesso!
Excuse me! / May I pass!
Single word — the most compact and natural option
Mi fa passare, per favore?
Can you let me through, please?
Slightly more elaborate version
Sto scendendo — posso passare?
I'm getting off — can I pass?
Add context when you're about to disembark
'Permesso' is one of the most useful single words in Italian — used to get past people, enter rooms, and interrupt conversations. On crowded Italian regional trains, especially commuter routes in Lombardy and Campania, practising 'permesso' or 'scusi, posso passare' will serve you well every journey.