What is an Activve Pawn move?

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Avatar of Machariel

I heard this term used once or twice: "active pawn move(s)". I think it was used by Alexandr Rakhmanov. Maybe in his courses or something. But what is that?

Example below has active pawn moves for white of a4 and h4-h5:

a4; h4-h5 active pawn moves