A talk page is a special Wiktionary page containing discussion about the contents of its associated "subject" page. To view the talk page of an article, click on the "discussion" tab at the top of the page. When you are in the talk page, clicking on "entry" will take you back to the main entry.
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On Wiktionary, the purpose of a talk page is to record past discussions related to the entry page it is attached to. Discussions include anything from those challenging the validity of the senses or entries to general questions about its etymology.