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I have seen this phrase in youtube comments:

the *sth* I didn't know I needed

Could you please explain what does it mean and in which cases should I use it?

closed as unclear what you're asking by lbf, Cascabel, J. Taylor, Mark Beadles, choster Feb 12 at 3:28

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Where a noun phrase is modified by a relative clause which it is not the subject of, the relative pronoun or relativiser ("who", "which", "that") is often omitted.

After verbs like "know", the "that" of an object clause is often omitted.

Here you have two "that"s omitted:

The (something) [that] I didn't know [that] I needed.

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    This 'something' turned out to be very useful to you, but until you discovered it you had not felt the lack of it. – Kate Bunting Feb 10 at 9:08

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