ولو استعمل في غيره يكون مجازا لا حقيقة
If the word is used for something other than its assigned meaning, the usage is figurative rather than literal.
Figurative transfer rests on a recognized relation between the original and intended senses, guided by context. A vessel may be mentioned while its contents are intended.
For example, “He drank the whole cup” does not mean consuming the cup itself; it means consuming its contents. The vessel–contents relation accounts for this usage. Interpretation cannot, however, invent any convenient alternative meaning merely to escape the established sense.