A polite request asking someone to inform or update you about something at a later time.
This straightforward phrase combines the permissive 'let' (from Old English 'laetan' meaning to allow) with 'know' (from Old English 'cnawan'). While simple in construction, it became a standard politeness formula in English, offering a gentle way to request information without seeming demanding or pushy.
Despite its simplicity, this phrase is a masterclass in polite communication - it frames a request as granting permission rather than making a demand. By saying 'let me know' instead of 'tell me,' the speaker positions themselves as waiting for the other person's convenience rather than commanding immediate attention.
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