сък

Etymology 1
From.

Noun

 * 1) twig, bough wooden part of a branch
 * 2)  splinter, stick, wooden rod (when cut out)
 * 3)  knot, snag, knob
 * 1)  knot, snag, knob

Usage notes
The modern language more commonly use the diminutives,. Сък is typically formal, with slight nuance of augmentation.

Etymology 2
Onomatopoeic.

Noun

 * 1) suss, hiss