Broadly speaking, bilingual convergence describes increased similarity between some elements of a bilingual’s two languages. (Used in this sense, convergence refers to the outcome of a developmental trajectory and not the process of converging.) Convergence enhances already existing similarities between those languages (Ameel et al., 2009; Alferink and Gullberg, 2013). This increased similarity manifests itself at different language levels including phonology and phonetics (Bullock, 2004; Chang, 2013) and morphology and syntax (Kantola and van Gompel, 2011; Sanchez, 2012; Bernolet et al., 2013).