Russian

Suffix

-ко • ‎(-ko)

1. Creates diminutives of neuter nouns and adverbs, normally having a colloquial register.

   тихо́нько ‎(tixónʹko, “quiet”) → тихо́нечко ‎(tixónečko, “very quiet”)

Usage notes

• The suffix is added to the stem of the word (i.e. minus its final vowel, if any). An epenthetic vowel often breaks up stem-final consonant clusters, and velars become palatals according to the Slavic first palatalization (both effects are due to the yer that occurred at the Proto-Slavic level). These effects can be seen in тихо́нечко ‎(tixónečko, “very quiet”), derived from тихо́нько ‎(tixónʹko, “quiet”), itself containing the same diminutive ending. (Specifically, starting from the stem *тихо́ньк-, a vowel is epenthesized, producing тихо́нек-, and the final velar is palatalized, producing тихо́неч-.) In general, the combination -ко + -ко produces -ечко ‎(-ečko) or -очко ‎(-očko).

Serbo-Croatian

Suffix

-ко ‎(Latin spelling -ko)

1. Suffix appended to words to create a masculine noun, usually denoting a negative feature.