tight-lipped
🇺🇸
/ˌtaɪt ˈlɪpt/
🇬🇧
/ˌtaɪt ˈlɪpt/
Not sharing information or keeping quiet about something.
Despite the rumors, government officials remained tight-lipped today.
Having lips pressed together, often showing anger or annoyance.
He marched out of the room tight-lipped and white-faced.