History: Received : 09 November 2023 Revised : 10 Januari 2024 Accepted : 25 Januari 2024 Published: 21 Febuari 2024 Publisher: LPPM Universitas Darma Agung Licensed: This work is licensed under Attribution-NonCommercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0) Jurnal Darma Agung Volume: 32, Nomor: 1, (2024), Februari: 163 - 170 https://dx.doi.org.10.46930/ojsuda.v32i1.3980 P-ISSN:0852-7296 E-ISSN:2654-3915 ROLE PLAYING STRATEGY IN ENHANCING STUDENTS’ IDIOMATIC EXPRESSION MASTERY Meikardo Samuel Prayuda 1) , Karisma Erikson Tarigan 2) Fakultas Keguruan dan Ilmu Pendidikan Universitas Katolik Santo Thomas, Medan, Indonesia 1,2) Corresponding Author: meichardohanon@gmail.com 1) Abstract This research discussed about the use of Role Playing Strategy in enhancing students’ Idiomatic Expression Mastery. This research was conducted to the grade X students of SMA SWASTA PKMI EFESUS AEK BATU. This research was conducted in Classroom Action Research in order to find out how the process of Role Playing Strategy enhanced the students’ Idiomatic Expression Mastery. From this research, it was found out that the implementation of the first cycle was last well but less condusive. The students mean score in the theoretical test was 62.57 while in practical test was 28.57. The result had not fulfilled the requirement so the second cycle need to be conducted. 4. Based on the next findings, the problems had already been fixed and the students’ mastery in learning was also improved. It can be seen from the students’ score in the theoretical test with the mean 80.00, while in the practical test was 85.71. The qualitative data showed positive improvement from cycle one to cycle two. It was found out that students were interested in learning by using role playing strategy. Therefore, it was concluded that teaching by using role playing was effective in improving the students’ idiomatic expression mastery. Keywords: Classroom Action Research; Idiomatic Expression; Role Playing Strategy Abstrak Penelitian ini membahas tentang penggunaan Strategi Role Playing dalam meningkatkan Penguasaan Ekspresi Idiomatik siswa. Penelitian ini dilakukan pada siswa kelas X SMA SWASTA PKMI EFESUS AEK BATU. Penelitian ini dilakukan dalam Penelitian Tindakan Kelas untuk mengetahui bagaimana proses Strategi Role Playing meningkatkan Penguasaan Ekspresi Idiomatik siswa. Dari penelitian ini diketahui bahwa pelaksanaan siklus I telah berjalan dengan baik namun kurang kondusif. Nilai rata-rata siswa pada tes teori adalah 62,57 dan tes praktik adalah 28,57. Hasilnya belum memenuhi syarat sehingga perlu dilakukan siklus kedua. 4. Berdasarkan temuan selanjutnya, permasalahan telah teratasi dan ketuntasan belajar siswa juga meningkat. Hal ini terlihat dari nilai siswa pada tes teori dengan rata-rata 80,00, sedangkan pada tes praktik sebesar 85,71. Data kualitatif menunjukkan peningkatan yang positif dari siklus satu ke siklus dua. Diketahui siswa tertarik belajar dengan menggunakan strategi role play. Oleh karena itu, disimpulkan bahwa pengajaran dengan menggunakan role play efektif dalam meningkatkan penguasaan ekspresi idiomatik siswa. Kata Kunci: Penelitian Tindakan Kelas; Ekspresi Idiomatik; Strategi Bermain Peran