Here’s how usage can change. When I was in school way back in the 70s I was told never to say climb down. Climb means only to ascend, move upward. The teacher showed us in the dictionary. Over the years, people have said climb down almost without reservation. Look up climb now and the primary definition is to ascend, but look long enough and noted and you’ll see the option of meaning descending by saying climb. Language is fluid enough to bring about definitional changes.