The subject of this thesis paper is frequency of idiom usage in academic surroundings. While defining an idiom is inherently complex, their frequent use in everyday communication highlights their significant role in language. The primary aim of the paper is to investigate the presence and usage of idioms within academic settings, focusing on their representation in a selected corpus. The study specifically addresses the frequency of idiom usage in both spoken and written academic discourse. To achieve this, research was conducted using two different corpora within Sketch Engine. The key findings indicate that idioms are more frequently used in spoken academic discourse than in written discourse. Further analysis revealed that the distribution of idioms varies across different event types within each corpus. This paper will contribute to the understanding of the status and significance of idioms in academic context, providing insight in the challenges language learners face while also showing student perspectives on the matter.