E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Defeat.
What though the field be lost? all is not lost. (Milton: Paradise Lost, i. line 1056.)
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All is lost but honour (Tout est perdu, madame, fors lhonneur) is what Francois I. is said to have written to his mother, after the Battle of Pavia in 1525.