动词短语
中文翻译：扣上
同义词：
['fasten', 'fasten up', 'secure', 'buckle']
例句：
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1. I need to button-on my coat before we go out.
我们出去之前我得把外套扣上。
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2. The buttons on the shirt are loose, so she needs to button-on them.
衬衫上的纽扣松了，她需要系紧它们。
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3. The car's door was button-on when I arrived, but it's now open again.
我到达时车门是扣紧的，但现在又打开了。