submarining
 n.— «The seat is also “active”: during a crash the rear section of the raised seat surface automatically sinks in a fraction of a second to prevent the child slipping under the belt—”submarining,” as it is called in the trade.» —“Is new VW kiddyseat the best yet?” Motoring (South Africa) Dec. 28, 2005. (source: Double-Tongued Dictionary)

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