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Definition of Down tack
1. Noun. (phonetics) The IPA diacritic of primary articulation: < ? >, used to denote a lowered phone; for vowels, the diacritic denotes a slightly more open utterance; for consonants, it moves the point of articulation one step forward in this chain: nasal ? plosive ? fricative ? approximant ? trill ? tap, flap ? lateral fricative ? lateral approximant ? lateral flap. ¹
¹ Source: wiktionary.com