This is a technical definition of what underlies Marked mirroring.

It means "pointed" or "pointing" communication, and is the way humans not only tell each other things, but also tell each other that they are telling them something important! It refers to the way that humans use tone of speech, eye contact, physical contact, etc, to place a "frame" around a piece of communication to emphasise that it is a bit special... To say "wake up, what I am about to say is important!"

This is particularly important when humans offer each other (particularly when a parent offers a child) what are called "second order representations" i.e.

"my understanding about how I think you are thinking and feeling in this situation."

See Academic references for work on this by Gyorgy Gergely.