Reconstruction:Proto-Slavic/stukъ

Etymology
Either or from  +.

Compare 🇨🇬, 🇨🇬 (with accute perhaps due to influence from ).

Forms with nasal vocalism (in West Slavic) may be instead from 🇨🇬, whence 🇨🇬.

Noun

 * 1) knock, crack, tap loud harsh noise

Descendants

 * East Slavic:
 * South Slavic:
 * Serbian Church Slavonic:
 * West Slavic:
 * South Slavic:
 * Serbian Church Slavonic:
 * West Slavic:
 * South Slavic:
 * Serbian Church Slavonic:
 * West Slavic: