Lost knowledge.

Meaning: This refers to information, understanding, or skills that were once known but have been forgotten or lost.

Choice of Words: Lost means something that cannot be found or recovered. Knowledge refers to information, understanding, or skills. 'Lost knowledge' refers to information, understanding, or skills that have been forgotten or are no longer known.

Alternative Expressions

Forgotten information

Meaning: This means that you used to know something but now you can't remember it anymore. It's like when you forget what you had for breakfast this morning.

Choice of Words: The word forgotten means that you can't remember something that you used to know. Information is the knowledge or facts that you have learned. When you put these two words together, it means that you can't remember the knowledge or facts that you used to know.

Vanished knowledge

Meaning: This means that you used to know something but now it's gone and you can't find it anymore. It's like when you lose a sock and you can't find it anywhere.

Choice of Words: The word vanished means that something has disappeared or is no longer available. Knowledge is the information or understanding that you have gained through experience or education. When you put these two words together, it means that the information or understanding that you once had is no longer available or cannot be found.

Related Expressions