unbuttoning

v.

解开（纽扣）( unbutton的现在分词 )；打开；表露；吐露

1. Step aside here and unbutton your vest please.
   请您到这边来一下，解开马夹纽扣。
2. Please unbutton your shirt and loosen your belt.
   请解开上衣的扣子

Unbuttoning implement.
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Movement Characteristics of the Buttoning and Unbuttoning of Front-opening Clothes:- Operations with One Hand and Daily Activities -