Plural of berth; designated mooring spots for ships in a harbor, or sleeping places for crew members aboard a ship.
From Old Norse 'bjorgr' (refuge) through Middle English 'berth,' with the standard plural '-s' ending.
A ship's berth arrangement wasn't random—officers got the best berths away from engine noise and vibration, while sailors in the 'hot berths' (used in shifts) would warm them up before the next sailor lay down!
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