Copperfasten Definition
verb
(historical) To protect the timbers [of a ship] with plates of copper secured with copper nails or bolts.
Wiktionary
(figuratively, UK, Ireland) To reinforce, strengthen; to make permanent, embed.
Wiktionary
Origin of Copperfasten
-
copper + fasten. From copper sheathing of ship hulls (to protect from damage by marine organisms. Originally copper sheathing but non-copper bolts were used, leading to corrosion. Later copper bolts (fasteners) were also used, eliminating corrosion issues. Literal sense from 18th century, metaphorical sense attested 1948.
From Wiktionary
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