geminate consonant sound change; sokuonbin
Linguistics term for a historical sound change in Japanese where a vowel-stem verb or adjective ending in -i, -chi, or -ri produces a geminate (small-tsu) consonant, typically 't', before certain suffixes. Often contrasted with 撥音便 (hatsuonbin).
See also: 撥音便
Through sokuonbin, 'tachite' became 'tatte'.
Sokuonbin and hatsuonbin are important examples of historical sound changes in Japanese.