Webster's Revised Unabridged Dictionary · 1913

Worst

Worst , adjective

[Old English werst, worste, wurste, Anglo-Saxon wyrst, wierst, wierrest. See Worse, a.]

Bad, evil, or pernicious, in the highest degree, whether in a physical or moral sense. See Worse.
Heard so oft in worst extremes. — Milton
I have a wife, the worst that may be. — Chaucer
If thou hadst not been born the worst of men, Thou hadst been a knave and flatterer. — Shakespeare

Worst , noun

That which is most bad or evil; the most severe, pernicious, calamitous, or wicked state or degree.
The worst is not So long as we can say, This is the worst. — Shakespeare
He is always sure of finding diversion when the worst comes to the worst. — Addison

Worst , transitive verb

[See Worse, transitive verb & a.]

To gain advantage over, in contest or competition; to get the better of; to defeat; to overthrow; to discomfit.
The... Philistines were worsted by the captivated ark. — South

Worst , intransitive verb

To grow worse; to deteriorate. [Rare]
Every face... worsting. — Jane Austen