Entry 3 senses · 3 variants Webster, 1913 Sicker /sĭk'-ẽr/ · Sick·er · IPA /ˈsɪkɚ/ v. i. a. adv. 01 v. i. To percolate, trickle, or ooze, as water through a crack. 1. To percolate, trickle, or ooze, as water through a crack.(Mining) [Prov. Eng.] 02 a. Sure; certain; trusty. 1. Sure; certain; trusty.[Obs. or Prov. Eng. & Scot.] “When he is siker of his good name.” — Chaucer. 03 adv. Surely; certainly. 1. Surely; certainly.[Obs.] “Believe this as siker as your creed.” — Chaucer. “Sicker, Willye, thou warnest well.” — Spenser.