the.com/rock face

means The sheer, exposed surface of a cliff or crag that climbers grip, scale, and occasionally curse their way up.

from Straightforward compound English: 'rock,' from Old French 'roche'/'roque' (itself from a Vulgar Latin word for a stone mass), joined to 'face' in its sense of 'the front or outer surface of something,' a usage that spread from human faces to the visible surfaces of buildings, clocks, and cliffs. The pairing is a plain 18th–19th-century geographic descriptor — no hidden story, just rock showing its face to the sky.