E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bow (to rhyme with flow).
(Anglo-Saxon, boga; verb, bogan or bugan, to arch.)
1
Draw not your bow till your arrow is fixed. Have everything ready before, you begin.
2
He has a famous bow up at the castle. Said of a braggart or pretender.
3
He has two strings to his bow. Two means of accomplishing his object; if one fails, he can try the other. The allusion is to the custom of the British bowmen carrying a reserve string in case of accident.
4
To draw a bow at a venture. To attack with a random remark; to make a random remark which may hit the truth.
5
A certain man drew a bow at a venture and smote the King of Israel.1 Kings xxii, 34.
To draw the long bow. To exaggerate. The long-bow was the famous English weapon till gunpowder was introduced, and it is said that a good archer could hit between the fingers of a mans hand at a considerable distance, and could propel his arrow a mile. The tales told about long-bow adventures are so wonderful that they fully justify the phrase given above.
6
To unstring the bow will not heal the wound (Italian). René of Anjou, king of Sicily, on the death of his wife, Isabeau of Lorraine, adopted the emblem of a bow with the string broken, and with the words given above for the motto, by which he meant, Lamentation for the loss of his wife was but poor satisfaction.