解开纽扣的英文：
unbutton
v. 解开…的钮扣；解开钮扣
- Come on, unbutton your shirt.
快点，把衬衫钮扣解开。 - Please unbutton your jacket.
请解开你的上衣。 - Who do you want to unbutton.
你想解开谁的纽扣。 - My little brother stand there, start to unbutton by himself.
我的小弟弟站在那里，自己开始解起纽扣。 - He stepped back a few paces and unbuttoned his overcoat
他后退了几步，解开了他的大衣。