“…In languages such as Hawaiian or Arabic, it is the primary allophone of the phoneme (Ladefoged & Maddieson, 1996;Maddieson, 1984), while in languages such as English or the Philippine language Ilokano, it is a regional or stylistic variant (Cruttenden, 2014;Olaya, 1967). Specifically, the oral plosive [t] (cat, later) in one accent of English may correspond to [ʔ] (glottalization) in other accents, or it may be conditioned by the environment or speaking style within one accent (see e.g., Fabricius, 2002;Gavaldà, 2016). Moreover, glottalization is often used as (2) a boundary signal of a lexical/grammatical unit, i.e., it has a demarcative function.…”