стираются грани

• СТИРАЮТСЯ/СТЕРЛИСЬ ГРАНИ между кем, между чем{{}}

[VPsubj; usu. this WO]

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⇒ the differences distinguishing, separating two or more groups or phenomena are disappearing:

- стёрлись грани между Х-ом и Y-ом{{}}≈ the boundaries (boundary lines, distinctions, differences) between X and Y were obliterated (erased, eliminated);

|| стираются грани между Х-ом и Y-ом{{}}≈ the distinctions (the boundaries) between X and Y are becoming blurred;

- the line between X and Y is becoming blurred;

- the boundaries (the differences) between X and Y are melting away.

     ♦ ...Растление литературы дошло до того, что совершенно стёрлись всякие грани между профессиональным писателем и пришедшим по блату (Войнович 1). The corruption of literature has gone so far as to have obliterated all the boundary lines between the professional writer and those who are published because they have pull (1a).

     ♦ ...Её увлекла праздничность этого вечера... атмосфера мужского, военного, солдатского единения, когда стираются грани субординации... (Рыбаков 2). ...She was taken with the festive atmosphere of this occasion:...the atmosphere of masculine, martial unity, when the boundaries of seniority became blurred... (2a).