Webster’s Revised Unabridged Dictionary · 1913
Sicker
Sick′er (sĭk′ẽr), v. i. [AS. sicerian.] (Mining) To percolate, trickle, or ooze, as water through a crack. [Also written sigger, zigger, and zifhyr.] [Prov. Eng.]
Sick′er, Sik′er, a. [OE. siker; cf. OS. sikur, LG. seker, D. zeker, Dan. sikker, OHG. sihhur, G. sicher; all fr. L. securus. See Secure, Sure.] Sure; certain; trusty. [Obs. or Prov. Eng. & Scot.] Burns.
When he is siker of his good name. Chaucer.
Sick′er, Sik′er, adv. Surely; certainly. [Obs.]
Believe this as siker as your creed. Chaucer.
Sicker, Willye, thou warnest well. Spenser.