A phrase used in several situations:
- To politely get someone's attention.
- To apologize for a minor social infraction (like bumping into someone).
- To ask someone to move so you can pass.
- Before interrupting a conversation.
- To signal disagreement politely (less common, tone is key).
- After a small bodily noise like a burp or hiccup (less common now, 'pardon me' sometimes used).