Wiktionary is a dictionary but to get the meaning of a word, one may look at several dictionaries, with different point of view and methodology. Lucky us, Wikisource contains plenty dictionaries to enhance Wiktionaries!
The idea is that entries of dictionaries in Wikisource may be displayed in Wiktionaries, in dedicaded pages associated to each Wiktionaries entries. Dedicated pages named "Other dictionaries", accessible through a tab next to the Talk pages.
In order to realize this feature, Dictionaries in Wikisource need to be properly tagged to delimitate paragraphs with entries and definitions. Then, a new tab should be created in Wiktionaries. Finally, a process need to be code to automatically populated those new pages with Wikisource content.
Example of the finite feature as dreamed: you go to English Wiktionary and look for the entry "''dog''". There is a tab "Other dictionaries". You click and a new page open displaying every definition tagged as "''definitions of dog (English)''" in English Wikisource. Then you move to French Wiktionary, to the entry "''chien''" (same animal). Here, you can have every definitions tagged as ''"definitions of chien (French)"'' from French Wikisource. A final move may be to look in French Wiktionary for "''dog''" and to obtain every definitions tagged as "''definitions of dog (English) in French''". This last feature may be part of a second step of development.
As examples, there is other ''multidictionaries'' working as suggested in this proposal: CNRTL for some ''Dictionnaire de l'Académie française'' [French Academy dictionaries] or Dico d'Òc for Occitan with 15 dictionaries.
This task was suggested during the Community Wishlist Survey 2017 and ends up rank 52, with 40 support votes.