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to let sb know
01
to give a person information about something
例子
She is letting them know that she will be late.
Why don't you drop me a line and let me know how you've been?
I let him know about the change in plans.
At the Fourth of July barbecue, my uncle used 'XYZ' as a discreet way to let me know my zipper was down, saving me from any embarrassment.
He gave his partner a ring to let them know he'd be home late.
