Is there a subset of the wiktionary that would include only meanings that are known to be necessary for learning English as a second language, or for learning common English idioms?
There is provision for this idea. If you have the time, you could consider participating in the separate project at Simple:Main Page that aims to do just that! This kind of simplification is not a simple undertaking, and it has not attracted a lot of interest. See also Simple English Dictionary on the Simple English Wikipedia.
Related Questions
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