Squeezing past someone politely

Con permiso

kon per-MEE-soh — Excuse me (making your way through)

"Con permiso, necesito pasar."
Excuse me, I need to get through.

Different from "perdona" — this one is specifically for physically moving past someone, like on a crowded train, not for getting someone's attention.

"What I say squeezing past someone on the metro at rush hour — at least twice a day, easily."— Graciela