Individuals rely on others’ expertise to achieve a basic understanding of the world. But how can non-experts achieve understanding from explanations that, by definition, they are ill-equipped to assess? Across 9 experiments with 6,698 participants (Study 1A = 737; 1B = 734; 1C = 733; 2A = 1,014; 2B = 509; 2C = 1,012; 3A = 1,026; 3B = 512; 4 = 421), we address this puzzle by focusing on scientific explanations with jargon. We identify ‘when’ and ‘why’ the inclusion of jargon makes explanations more satisfying, despite decreasing their comprehensibility. We find that jargon increases satisfaction because laypeople assume the jargon fills gaps in explanations that are otherwise incomplete. We also identify strategies for debiasing these judgements: when people attempt to generate their own explanations, inflated judgements of poor explanations with jargon are reduced, and people become better calibrated in their assessments of their own ability to explain.