The project "Suppletion and Meaning" ran from 2019 to 2023 as a Junior research Fellowship at Trinity College, University of Oxford. It investigated the links between lexical meaning and suppletion. If it has been shown that a wide range of meanings can present suppletion in their inflectional paradigm, there are recurrent patterns with some meanings presenting more often inflectional suppletion in their paradigm than other meanings: this is the case for dimension adjectives, for evaluative adjectives, the verbs go, be, come, as well as nouns for people, in addition to the first ordinals in numeral series.
This project investigated why such patterns are observed, considering that they indicate that such meanings are more prone to the development and sustainance of (extreme) irregularity.
I showed that suppletion arises in such lexemes when a lexical relation such as synonymy or hyponymy holds for a subset of the paradigm. In other words, when the meaning of a root plus a specific inflectional feature value is synonymous (hyponymous, etc) with another lexeme.
Manuscript under revision for publication in a journal.
This is a typological investigation of the patterns of suppletion observed in the languages of Australia. Some common patterns are absent for good reasons (no ordinal suppletion because most languages do not have ordinals), but most of the others are well attested in all word classes.
Joint work with Erich Round.
It is often believed that the lexical part of periphrastic structures does not show suppletion. A large number of northern Gallo-Romance varieties show exactly this type of suppletion, whose patterns and origins are explored here.
Bach, Xavier. 2022. Overlapping suppletion and periphrasis: On HAVE, BE, and GO in Gallo-Romance. Word Structure 15(2), 115–137.
This (unpublished) work investigates the very rare cases where lexical categories supplete for case or gender. Pronouns commonly show suppletion for case and gender, but this is not the case for nouns where only a handful of examples of suppletion for case can be found, or adjectives where suppletion for gender is incredibly rare.