(尤指衣物)解开纽扣;(比喻)放松拘谨、变得更随和健谈。(也可作名词,指“解扣动作/解扣处”,较少见)
/ʌnˈbʌtən/
Please unbutton your coat when you come inside.
进屋后请把外套的纽扣解开。
As the evening went on, he began to unbutton—sharing stories and laughing more freely than usual.
随着夜色渐深,他变得不再拘谨,开始更自在地分享故事、笑得也比平时更开怀。
由前缀 **un-**(表示“解除、反向”)+ button(纽扣)构成,字面意思就是“把纽扣解开”。从“解开衣扣”这一动作,引申出“放松、变得更自然”的比喻义。