foot fault n. in jurisprudence, a minor criminal or procedural violation; a legal misstep. Etymological Note: This is a direct borrowing from net-based sports, such as tennis, badminton, and volleyball, where a foot fault is the placement of a foot outside the baseline when serving. (source: Double-Tongued Dictionary)
Further reading
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A listener named Tami contacted the show by WhatsApp to say that whenever someone would be talking about a subject that nobody else knew anything about, her father-in-law would respond with I had one of those, but the wheels came off. This is part...