Throughout time, the predominant use of certain languages has allowed some nations to take control over others and assure for them a privileged position. This study unveiled how certain practices and ideologies in regard to bilingualism have influenced teachers' professional development. Data were collected through discussion group sessions, reflective journals, and protocols from five teachers from a private K-11 school in Bogota. Analysis indicated participants' discourses drew on "hegemonic," "colonial," and "manipulative" ideas. Nevertheless, when dialoguing and "peer coaching," a discourse of "resistance" was constituted. The study suggested further research into teachers' professional growth, bilingualism, and bilingual education in monolingual contexts as the Colombian one.