The process of installing or constructing bulkheads in a ship or structure; the bulkheads themselves collectively.
From 'bulkhead' plus the gerund-forming suffix '-ing.' Bulkhead itself comes from 'bulk' (cargo hold) and 'head' (partition or boundary), originating in nautical contexts.
Gerunds like 'bulkheading' are incredibly productive in English—any verb becomes a noun by adding '-ing,' so shipbuilders could talk about the actual work of building these safety dividers.
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