A lot vs. Alot: 9 Grammatical Pitfalls
c.1300, "to daze or render unconscious" (from a blow, powerful emotion, etc.), probably a shortening of Old French estoner "to stun" (see astonish). Stunning popularized for "splendid, excellent" c.1849.
The legs: Everybody stir your stumps when Pa calls (1460+)