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| cop·per-fas·ten (past and past participle cop·per-fas·tened, present participle cop·per-fas·ten·ing, 3rd person present singular cop·per-fas·tens) |
transitive verb |
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| Definition: |
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U.K. make binding: to make an agreement binding
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| [< the use of copper fastenings on ships to prevent corrosion] |
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