from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. For lack of something better.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. For want of something better; for lack of an alternative.
French : faute, lack + de, of + mieux, better.(American Heritage® Dictionary of the English Language, Fourth Edition)
Borrowing from French. (Wiktionary)