This is a strange name for a process, but when you know how it affects the cliff face, it is easy to see where the name comes from.
During the day, the heat of the sun makes the rock expand. However, when night comes on and the air cools, the rock shrinks again. The next day, it expands again, and so on. This repeated process results in the cliff face "shedding its skin" like an onion; basically, the outer layer peels of and falls into the sea.
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