A lāzim is a connected meaning to which the mind can reasonably pass from the expressed meaning. In kināyah, the listener derives an associated feature or fact from what is said. This association may depend on habit, established usage, or a contextual relation.
“Ṭawīl al-nijād” — having a long sword strap — can conventionally point to great height. The relationship need not be a mathematically necessary equivalence for every person and every sword strap.
Understanding kināyah therefore requires attention to the linguistic and cultural conventions that connect a stated feature with the intended characteristic.