This book deals with the characterization and history of the reaction object construction (ROC), as in Pauline smiled her thanks. The ROC consists of an intransitive verb followed by a nonprototypical object that expresses a reaction such that the whole syntactic unit acquires the extended meaning "express X by V-ing" (e.g. "Pauline expressed her thanks by smiling"). The hypothesis is put forward that ROCs follow a similar pathway as other valency-increasing constructions such as the cognate object construction and the way-construction, occurring first with more transitive-like verbs and then expanding to intransitives. Historical corpus evidence from several complementary data sources confirms this idea and reveals striking parallelisms with the way-construction.