This article offers a conceptual analysis of collusion, the often overlooked relative of plagiarism in debates on academic integrity. Considered as an inherently social phenomenon, we present the results of a systematic effort to understand the anatomy of collusion. The term's meanings and associated governance practices are compared for contexts outside higher education. These are considered alongside a thematic analysis of publicly available UK university academic integrity documentation that specifies for students what counts as collusion. We indicate how current guideline practice can (1) appear incomplete by concentrating on classroom peers, (2) create blurred boundaries around useful collaboration, peer review and dishonest practice and (3) be so unrealistic as to have unwelcome, unintended consequences for students and staff. Taking an ecological perspective on the conditions of collusion emphasises how these guidelines-by seeking to constrain social interactions around assignment work-may create an uncomfortable incoherence between their prescriptions and well-established patterns of study.actions may, on one occasion, be judged 'collusion' (which observers condemn), while, under different circumstances, they may be judged 'collaboration' (which observers celebrate). The management of source attribution is a key responsibility for students to exercise in preparing their coursework. Yet understanding exactly which sources need to be acknowledged may be a significant challenge; collusion may awkwardly overlap with apparently legitimate occasions of 'mere collaboration'.There is little understanding of how far the proscriptions in collusion guidelines serve to constrain or direct students' collaborative study. It is known that students' recognition and reading of these guidelines is limited (Ashworth et al., 1997;Barrett & Cox, 2005;Adam et al., 2017). However, even where guidelines are known, their proscriptions may not align with students' native understanding of appropriate study or assessment practices. In this article we do not interrogate students' perspectives on such guidelines directly. However, we complement McGowan's (2016) analysis of institutional guidelines and, more specifically, her call for attention to the contextual and social nature of collusion. Our analysis serves to illustrate institutional perspectives on the nature of collusion and identifies challenges of interpretation that students therefore may face.It is important to be clear about the meaning of key concepts that organise relationships within educational practice. For example, Eriksen (2018) has illustrated the significant impact of differently understood meanings for the term 'bullying'. Accordingly, in the next section we examine the term 'collusion' with reference to its formal definition and identify three core features: sociality, intent and concealment. However, we recognise Austin's (1961) observation that sentences have 'meanings'not words. In the third section we therefore respect this advice by considering the social ...