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Webster 1913 Edition

adv.

Hastily; immediately; instantly; on the spot; hotfoot.

Gower.

Custance have they taken anon,

foothot

Chaucer.

adv.

Immediately; a word borrowed from hunting.

foothot ‎(comparative more foothot, superlative most foothot)

Without stopping or slowing down; immediately, at once.
- 1485, Sir Thomas Malory, chapter xxviij, in Le Morte Darthur, book IX:
  Thenne there came two knyȝtes of Northgales / that one hyghte Hewe de la montayne / and the other syr Madok de la montayne / & they chalengyd fire launcelot foote hote / Syr Launcelot not refusyng hem but made hym redy