Flou phraséologique, quasi-grammaticalisation et pseudo marqueurs de discours: Un no man’s land entre syntaxe et discours?

The aim of the paper is to compare three related domains that still largely ignore each other in linguistics, namely phraseology, grammaticalization, and Construction Grammar. First, we show that phraseology and grammaticalization are distinct areas which nevertheless have many linguistic criteria in common : (i) opacity and non-compositionality (in phraseology), semantic shift and (inter-)subjectification process (in grammaticalization); (ii) syntactic rigidity (in phraseology), syntactic and prosodic autonomy (in grammaticalization); (iii) collocability and lexical attractiveness (in phraseology), syntagmatic and phonological coalescence (in grammaticalization). Secondly, we explore the so-called "constructionalization" process applied to complex verbal units, which can be defined gradually as phraseological units (in synchrony) that have been pragmaticalized (in diachrony). This constructional approach thus raises the question of where to place the boundary between syntax and lexis, and between syntax and discourse