The Proto-Turkic word *kičük / kičüg
Word *kičük / kičüg
Meaning small, little

Comments
S. A. Starostin, A. V. Dybo, O. A. Mudrak - An Etymological Dictionary of Altaic Languages, 2003, Brill

Other words that might be of interest
*bedü-k ‘big, high’, *ẹ̄g-id- ‘to grow, bring up, high, raised up, huge’, *gēŋ ‘wide’, *gür ‘courageous, thick, abundant, wide, broad, well fed’, *ulug ‘big, great’, *deg- / dög- / dog- ‘round’, *tom- ‘round’