Emma Betz, Arnulf Deppermann, Lorenza Mondada & Marja-Leena Sorjonen (eds). OKAY across Languages: Toward a Comparative Approach to Its Use in Talk-in-Interaction. Amsterdam: John Benjamins, 2021. viii + 440 pp. ISBN 978-90-272-0815-6 (hbk) / 978-90-272-6028-4 (ebk) https://​doi​.org​/10​.1075​/slsi​.34