0 Someone who is tight-lipped is pressing their lips together to avoid showing anger, or is refusing to speak about something:
1 refusing to say very much about something:
A somewhat clinical, earnest, tight-lipped, almost embarrassed, tone often characterizes their discourse on this topic.
I am afraid that privatisation has made the water industry even more tight-lipped about giving the public information.
However, he was tight-lipped about much of his early work.
He hinted at something big taking place in the future, but has since remained tight-lipped regarding the news.
She remains tight-lipped and won't even tell them her name.
One minute joking and talkative, the next tight-lipped and silent.
He is said to have no expressions other than a grim, tight-lipped look of domineering authority.
He was later recalled as handsome and confident, but criticised for appearing tight-lipped and clenched and providing long and convoluted answers to questions.
