Answer :
The meaning of the idiom underlined in the excerpt is nothing is difficult, anything can be achieved with patience and effort.
What is an idiom?
A phrase is used in a language that is unique to it because it uses words in an unusual way or because its meaning cannot be determined from the meanings of its main elements.
In the given excerpt, the idiom "even a burro can climb a palm" shows that nothing is difficult, anything can be accomplished.
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