A recurring expression (note: Candidate expression) crosses (6 passages, no note) the threshold (note: Publication threshold) without any note (note: Note) defining it. It has a keyword page (note: Keyword) built from its passages (note: Passage), but no definition (17 passages, no note).
Check (note: Check) W-TERM-UNDEFINED, severity (note: Severity) warning by default, documented with a before and after example in the check pages. The severity can be overridden per project (note: Project) or per repository (note: Knowledge repository).