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present participle and gerund of fasten examples
plural fastenings
A hook or similar restraint used to fasten things together; fastener. quotations examples
The Rail Accident Investigation Branch's preliminary examination of the site of a cement train derailment at Sheffield station on November 11 found that a series of rail fastenings had broken, some before the accident, causing the tracks to spread under the train.
2020 December 16, “Network News: Broken fastenings caused derailment”, in Rail, page 13