To be tight-lipped about something

Meaning

To refuse to talk about something.

Examples

• John: 'He's being <b>tight-lipped about the incident</b>; we don't know the full story.'<br>
• Alice: 'That's suspicious; something doesn't seem right.'
• John: 'Perhaps she's still making up her mind.'
• Alice: 'She remained <b>tight-lipped about her plans</b> for the future.'<br>