Expert as in cap To close or secure something tightly, often used metaphorically as in keeping quiet or silent. Clear All
3 Example Sentences Showcasing the Meaning of 'Button Up'
The detective urged the witness to button up about the ongoing investigation.
The spy had to button up his lips to avoid revealing classified information.
The astronaut had to carefully button up his spacesuit to ensure a tight seal before venturing into outer space.
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