Learn what "all this was here and i didn't know" means, when people say it, and how to use it naturally in English.

It means the speaker is surprised that something existed there without their knowledge.
From The Haunted Sisters, Episode 28
Someone realizes an important fact has been right there without them knowing it.
Use this when you discover something unexpected and want to admit you were unaware of it. It is natural, but this exact sentence is not a strong standalone search phrase.
Scenes unlock real expressions as you watch
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