1
unbutton sth
unbutton 后接有纽扣的衣物作宾语，如衬衫、外套。
She unbuttoned her coat before sitting down.
她坐下前解开了外套的纽扣。
解开…的纽扣；解开纽扣
先理解核心含义，再看它在真实句子里的用法。
解开…的纽扣；解开纽扣
undo the buttons of
She unbuttoned her coat before sitting down.
她坐下前解开了外套的纽扣。
解开(某物)的纽扣以打开。
To open (something) by undoing its buttons.
unbutton
Base
原形
unbuttons
3rd person
第三人称单数
unbuttoning
-ing
现在分词
unbuttoned
Past
过去式
unbuttoned
Past participle
过去分词
She unbuttons her coat before sitting down.
她坐下前解开外套的纽扣。
He unbuttoned his shirt quickly.
他迅速解开了衬衫的纽扣。
I am unbuttoning my jacket.
我正在解开夹克的纽扣。
unbutton 是规则动词，过去式和过去分词均为 unbuttoned，现在分词为 unbuttoning。
She unbuttoned her coat before sitting down.
她坐下前解开了外套的纽扣。
He unbuttoned his shirt and rolled up his sleeves.
他解开衬衫的纽扣，然后卷起了袖子。
This cardigan unbuttons at the front.
这件开衫在前面解开纽扣。
unbutton 后接有纽扣的衣物作宾语，如衬衫、外套。
She unbuttoned her coat before sitting down.
她坐下前解开了外套的纽扣。
表示衣物本身可以解开，或说明其解开方式时，不带宾语，例如：这件连衣裙可从背后解开。
The shirt unbuttons at the front.
这件衬衫的纽扣在正面解开。
Not this
Untie your shirt.
Use this
Unbutton your shirt.
汉语“解开”可对应 untie 或 unbutton，但说纽扣时英语用 unbutton；untie 用于绳结、鞋带等。因此要表达“解开衬衫（的纽扣）”应说 unbutton your shirt。
Not this
He unbuttoned his shirt's buttons.
Use this
He unbuttoned his shirt.
unbutton 本身已含“解开……的纽扣”之意，宾语应是衣物而不是 buttons。这是把“解开衬衫的纽扣”直译成英语造成的冗余，应将衬衫作为宾语。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
解开衬衫的纽扣
He unbuttoned his shirt and lay down on the grass.
他解开衬衫的纽扣，在草地上躺了下来。
解开外套的纽扣
She unbuttoned her coat before sitting down.
她在坐下前解开了外套的纽扣。
解开衣领的纽扣
He unbuttoned his collar and loosened his tie.
他解开衣领的纽扣，松了松领带。
解开牛仔裤的纽扣
He unbuttoned his jeans and took them off.
他解开牛仔裤的纽扣，把牛仔裤脱了下来。
从背后解开纽扣
This dress unbuttons at the back.
这条连衣裙从背后解开纽扣。
Use unbutton naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
un（相反）+ button（纽扣/按钮），想象按一下“解开”键，纽扣就松开。
语域：neutral 常见场景：日常对话、衣物描述 通常用于谈论解开衣服的纽扣，是日常生活中的常用说法；正式写作中较少出现，多用于口语或实用描述。
单词 button、mutton、glutton 的结尾 -utton 都读 /ʌtən/，与 unbutton 中重读的 /bʌtn/ 押韵。注意 cotton、rotten、kitten 拼写相近，但读音分别为 /ˈkɒtən/、/ˈrɒtən/、/ˈkɪtən/，元音不是 /ʌ/。
Dictionary facts from ECDICT, WIKTIONARY.