How we talk about bilingualism has an effect on how others think about bilingual individuals, and in turn, how "active bilingual learners/users of English" (ABLE) students are assessed and taught in schools. I use a transdisciplinary approach of bridging social semiotics, applied linguistics, psycholinguistics, and cognitive linguistics to explain how code-switching is metaphor, an external perspective of bilingualism as inter-domain linguistic mapping and translanguaging is metonymy, an internal perspective of intra-domain linguistic mapping. By placing translanguaging/metonymy on the syntagmatic axis and code-switching/metaphor on the paradigmatic axis, I demonstrate through example sentences of monolingual and bilingual speech and figures, how accepting the inaccurate metaphor of bilingualism as just code-switching alone, sets in motion countless dichotomies that act to create the bilingualism-as-problem orientation for ABLE students in U.S. schools; most specifically for those at the intersection of bilingualism and disability. A transdisciplinary view of bilingualism includes both an internal perspective (translanguaging, metonymic combination of parts of the whole linguistic repertoire on the syntagmatic axis), plus an external perspective (code-switching, metaphoric alternation of linguistic features from diverse named languages on the paradigmatic axis). I conclude with implications for a more appropriate description of bilingualism and its role in education.