<![CDATA[Idiomatic expressions pose persistent challenges for Indonesian EFL learners due to their figurative meanings and culturally embedded nature, leading many students to rely on unstructured online sources that provide limited support. This study aimed to develop a bilingual idiom flipbook that addresses these challenges by offering clear explanations, cultural notes, visual support, and interactive practice. Using a research and development design, the study involved a needs analysis with fifty students, a formative evaluation through an FGD with four lecturers and ten students, and a summative evaluation with twenty learners. The findings show that students frequently encounter idioms but struggle to interpret them, and they responded positively to the flipbook’s clarity, cultural relevance, layout, illustrations, and QR-code-based activities, resulting in high ratings across all evaluation dimensions. These results indicate that students perceived the flipbook as clear, culturally relevant, usable, and supportive of independent idiom learning. The findings demonstrate strong user acceptance and alignment with learners’ reported needs, but they do not establish improvement in idiom comprehension or retention. The study contributes a pedagogically grounded, multimodal, and culturally informed learning tool and provides a transparent development model that future researchers can replicate or adapt for similar R and D-based material creation.]]>
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