c. 1400 (mid-14c. as Anglo-French forechasteil), "short raised deck in the fore part of the ship used in warfare," from Middle English fore- "before" + Anglo-French castel "fortified tower" (see castle (n.)). In broader reference to the part of a vessel forward of the fore rigging, late 15c.; hence, generally, "section of a ship where the sailors live" (by 1840). Spelling fo'c'sle reflects sailors' pronunciation.
1. There was no answer from the forecastle.
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2. The forecastle was like an angry hive of bees aroused by some marauder.
3. The ship is designed to have continuous main deck , forecastle and poop.