This article examines the semantic value of the infinitive in the ingressive constructions se mettre à (SMA) and commencer à (COMA) using a distinctive collexeme analysis. We find that the collexemes significant for the construction SMA are fairly homogeneous across the different corpora and can be grouped into the general category of expressive collexemes. The collexemes significant for COMA are more heterogeneous and belong to the category of cognitive collexemes and to semantic fields of sensory and creative acts. The results are compatible with the hypothesis put forward by Verroens and De Cuypere (2023) stating that the overall meaning of the SMA construction is intrinsically punctual. The punctual value of SMA is not only compatible with expressive collexemes, but, moreover, emphasizes their unforeseen and unintentional meaning. Conversely, the incremental value of COMA is consistent with the gradual onset of cognitive and sensory collexemes.