\Sick"er\, 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\, Siker \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\, Siker \Sik"er\, adv.
Surely; certainly. [Obs.]
      Believe this as siker as your creed.     --Chaucer.
      Sicker, Willye, thou warnest well.       --Spenser.