Pawn Break & Pawn Rupture


Definition of pawn break is not agreed upon. I've never heard term "pawn rupture".
Simple definition of pawn break is a pawn advance that breaks up the opponent's pawn formation or opens a file for your rook or a diagonal for your bishop.
McDonald's book The Giants of Strategy describes "the strategic motif of moving a pawn up alongside your most advanced pawn". He says the idea goes back at least as far as Nimzowitsch. Kmoch calls pawns side-by-side a duo ; Philidor referred to them as a phalanx. Kmoch calls the most advanced or leading pawn the "head pawn", and describes the advantage of bringing another pawn up beside it to form a "head duo".
"What is a pawn break ?" was asked & answered on chess.stackexchange.com/questions/1181/what-is-a-pawn-break about 7 years ago. Idea of forming a duo was one of answers, but no agreement.
Summary, a pawn break is a pawn advance that breaks up opponent's formation ( broad definition ), or forms a pawn duo ( narrow definition ).

The above-mentioned link is about the pawn rupture. Still I'm struggling to comprehend what the pawn rupture exactly is and what it differs from pawn break.

Looked at the article on thechessworld.com . Game is Shirov-Svidler 1997. Move 21. ...e5 is described as a "rupture". This meets the broad definition of a pawn break as it breaks up the opponents formation. However it does not satisfy McDonald's narrow definition of forming a pawn duo. Actually it separates Svidler's duo , the Sicilian "little center" with pawns on d6 & e6.
Chebyshev's comment that it may be a poor translation is probably the explanation.
The question could be posted on chess.stackexchange.com . Generally the answers there are high quality.

You can have a ruptured pawn structure, this much I’ve regularly heard of: that is just an umbrella/generic term for a structure that’s compromised in some way, whether the pawns be isolates, doubled, backward, whatever.
As has already been mentioned, in this specific case it sounds like a translation thing. Pawn break is what they mean (I’ve also heard it referred to as a pawn lever).