different between remast vs demast

English

re- +? mast

remast (third-person singular simple present remasts, present participle remasting, simple past and past participle remasted)

(transitive) To furnish with a new mast or set of masts.
- 1952, C. S. Lewis, The Voyage of the Dawn Treader, Collins, 1998, Chapter 7,
  In a few days now the Dawn Treader, remasted, repainted, and well stored, was ready to sail.

'maters, Amster, METARs, Master, Stream, armest, armets, master, mastre, maters, matres, metras, ramets, ramset, stream, tamers, tremas, trémas

de- +? mast

demast (third-person singular simple present demasts, present participle demasting, simple past and past participle demasted)

(transitive) To remove the mast from (a sailing ship) for storage.
(transitive) To break the mast of (a sailing ship) in an accident.
The powerful storm demasted the ship.

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