Lack, v. i. 1. To be wanting; often, impersonally, with of, meaning, to be less than, short, not quite, etc.
What hour now?
I think it lacks of twelve. Shak.
Peradventure there shall lack five of the fifty. Gen. xvii. 28.
2. To be in want.
The young lions do lack, and suffer hunger. Ps. xxxiv. 10.