
Mark you
Emphasis on Age
Use 'mark you' to emphasize a trait that contrasts with what was stated just before.

He's very playful, mark you, but he's also incredibly responsible.
Unexpected Qualifier
'Mark you' introduces a point that may surprise the listener, providing a twist to the sentence.

This painting is quite ordinary, mark you, but it's worth a fortune.
Adding Perspective
Use it to provide additional information that gives perspective or balance to a statement.

They arrived late, mark you, due to unforeseen traffic.
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