Meaning of BUTTON in English

BUTTON

[verb] [T]Button (up) your coat, it's cold out.(esp. US informal) The expression button it is a forceful way of telling someone to stop talking.Button it, OK! I'm trying to think.A button-down collar on a shirt is a collar that has the pointed ends fastened to the shirt by buttons.See picture: Collars and ties

Cambridge English vocab.      Кембриджский английский словарь.