Fasten buttons tightly.
Meaning: This means to make sure buttons are securely fastened so that clothes do not come apart. It's like saying, Make sure the buttons are attached firmly to keep your clothes together.
Choice of Words: Fasten means to attach or secure something in place. Buttons are the small objects used to fasten clothing, and tightly means to do so firmly or securely. In this context, the sentence instructs the listener to attach buttons securely to prevent clothing from coming undone.
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Related Expressions