button-mouthed
adjectiveUK /ˈbʌtn maʊðd/
US /ˈbʌtn maʊðd/
Keeping your mouth closed and not telling a secret.
She stayed button-mouthed about the surprise party.
RELATED WORDS
OTHER MEANINGS
2. Having a small mouth shaped like a button.
The doll had a button-mouthed little face.
3. Refusing to speak or answer questions.
He sat button-mouthed while the teacher asked who broke the vase.
4. Keeping quiet to avoid trouble.
Better stay button-mouthed until the coach calms down.