I've copied this sentence from an online test site, englishpage. I don't understand the use of back and down together here. Don't they imply similar meanings in this context? Please also explain the sentence, too. I'm having confusion about the meaning, too.
Lily had problems climbing back down from the tree house because she had injured her ankle as she was climbing down.
Yes, it may appear to be tautology as they suggest the same thing in some ways. However, it's natural English to use the two together to mean that someone is returning in a downward direction. It clarifies things to mean there's no confusion about what is happening and in what direction.
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Yes, it may appear to be tautology as they suggest the same thing in some ways. However, it's natural English to use the two together to mean that someone is returning in a downward direction. It clarifies things to mean there's no confusion about what is happening and in what direction.