Chain termination process involving transfer of a group to a reagent (the catalyst) that in turn transfers that group to a
propagating species to terminate a chain and regenerate the original reagent.
Source:
PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1116 (https://doi.org/10.1515/pac-2020-1211)