shoulder-to-shoulder, elbow to elbow, arm in arm, cheek by jowl, side-by-side (in close proximity) · shoulder-to-shoulder, elbow to elbow, arm in arm, cheek by jowl, side-by-side (whilst closely cooperating)
eş: łeb w łeb, pierś w pierś, ramię przy ramieniu, ręka w rękę
köken: From Old Galician-Portuguese acaron, a caron (13ᵗʰ century, Cantigas de Santa Maria). From a (“at”) + carón, either from an archaic Latin *carōnem, from carō (“meat”), or from a substrate language.