Longman Dictionary of Contemporary English homepage

button

2 verb
     
button2 [intransitive and transitive]
1 also button up to fasten clothes with buttons or to be fastened with buttons:
Sam, make sure Nina buttons up her jacket.
2

button it!

British English button your lip/mouth American English spoken used to tell someone in a rude way to stop talking
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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