I don't know
Example: I don't know the answer to your question.
Definition
"I don't know" is an expression used to indicate a lack of knowledge or information about something. It communicates uncertainty or inability to provide an answer, as in the phrase, "I don't know the answer to your question."
Etymology
The phrase "I don't know" comes from the Old English roots of the words 'I', 'do', 'not', and 'know'. 'Know' originates from the Old English 'cnāwan', meaning to perceive or understand. The phrase developed as a simple, direct way to express lack of knowledge.
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"I don't know" appears in the Vocaplus list "English - General - Idioms and Proverbs - (A1) - set 1", containing 104 commonly used expressions.
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