i Register
In some senses, fourth-rate is marked as UK, historical, idiomatic. Watch for register when choosing this word.
fourth-rate
adj 2noun 1
Definitions
adj
1
Of a Royal Navy ship of the line in the Napoleonic Era: having 50–60 guns across two gun decks, a complement of 320–420, and weighing approximately 1,000 tons burthen.
2
Terrible, awful; less than third-rate.
noun
1
A fourth-rate ship of the line.
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