A good many times I have come across the sentence "Let me stop you there". What does it mean?
closed as off-topic by Lambie, FumbleFingers, JMB, user3169, Andrew May 13 '18 at 22:39
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Let me stop you there
means that the person who says those words has decided that what you are saying is demonstrably wrong and wishes to pose a rebuttal before you continue laying out your statement or argument.
Note that this can be fairly rude, so in a conversation with a stranger, say, you'd be advised not to use it.
Let me interrupt you and tell you something.
It is an idiomatic way of interrupting the other party with the intention of giving new information that might surprise or contradict the other person.