Park, Jae-Eun. 2017. “On Replacing”. The Sociolinguistic Journal of Korea 25(3). 139~164. This study examines a reparative operation that occurs in the same turn: replacing. Based on about 100 instances of replacing in Korean conversation, the paper mainly focuses on specifying what replacing achieves. The analysis shows that replacing is largely classified into two functional categories: correcting and adjusting. Correcting handles a wide range of ‘innocent’ errors, from slips of the tongue to those that reflect momentary failing in various cognitive activities. Adjusting, on the other hand, targets a non-error, conveying various interactional import within the particularities of each different context. After a brief presentation of correcting, this paper focuses on showing three main adjustment types, namely perspective, scope, and degree adjustments. It also raises the possibility that adjusting may fail to achieve the goal that it has set out to.