A community’s customary use of a term may be narrower than, or differ from, an older dictionary meaning. In a commercial exchange, the name of a commodity may be understood in the customary local sense. A remote dictionary meaning should not automatically override that understanding.
But invoking custom is not enough by itself. The relevant time, place, prevailing usage, and any express contrary wording must be established.
Method: Ask first whether the literal sense remains possible and in use; then whether a legally relevant indicator supports figurative application. An unusual result is not, by itself, proof of metaphor.