student asking question

What does "for an instant" and "fold in" mean here?

teacher

Native speaker’s answer

Rebecca

The expression "for an instant" means for a brief amount of time. It is the same as the expressions "for a moment" or "for a second". To "fold in" in this context means to fall apart. "Fold in" is not a common phrase to use in this context, and it is more common to say "fall apart" here.

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