Learn what "i will be back before you know it" means, when people say it, and how to use it naturally in English.

This means the speaker expects to return quickly and wants the listener not to worry.
From Trial Marriage To A Billionaire Season 2, Episode 4
The speaker promises to return very soon.
Use this to reassure someone before leaving. It is friendly and common, though slightly more dramatic than a simple 'I'll be back soon.'
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