Haqiqah and majaz ask whether a word is used in its assigned or a transferred sense. Sarih and kinayah instead ask whether the intended content is directly manifest or needs supporting indication.
“I sold this book” has relatively explicit transactional content. By contrast, “our relationship has ended” may require further context or intention before its legal significance can be determined. This is an explanatory contrast, not a rule that every vague sentence is a legally operative allusion.