The phrasal verb "button up" is most commonly used in informal contexts, though it can occasionally appear in semi-formal settings, especially when discussing clothing. It generally means to fasten all the buttons on a piece of clothing, such as a shirt or coat, particularly to protect against the cold or to make oneself presentable. Additionally, "button up" can be used metaphorically to mean finishing up tasks, finalizing details, or remaining silent or tight-lipped about a subject. This latter usage is more prevalent in informal speech. The metaphorical sense can imply a sense of closure or discretion, often used in situations where one is encouraged to keep plans or strategies confidential. Understanding the context is crucial to discerning whether its use pertains to clothing or a form of closure or confidentiality.
B2
UpperIntermediate
1. To fasten the buttons of clothing, especially as preparation for going out or to keep warm.
She hurried to button up her coat before stepping outside into the chilly wind.
Make sure the kids button up their jackets before heading to the park.
2. To complete or finalize something, often referring to concluding a task or agreement.
We need to button up this deal before the end of the quarter.
The team worked late into the night to button up the project in time for the deadline.