Where does “жалоба” come from?

жалоба (Belarusian) comes from Old East Slavic жалоба, from Czech žaloba, from Czech -oba, from Old Czech -oba, from Proto-Slavic -oba — Deadjectival, forming abstract nouns; -ness.

жалоба (Belarusian): mourning

Definitions

mourning

Ancestry of “жалоба”, step by step

Step	Language	Word	Meaning
1	Old East Slavic	жалоба	grief, regret
2	Czech	žaloba	complaint, lawsuit, accusation, action,...
3	Czech	-oba	Appended to adjectives to form nouns meaning “the...
4	Old Czech	-oba	—
5	Proto-Slavic	-oba	Deadjectival, forming abstract nouns; -ness

Every word from Proto-Slavic -oba →Every word from Czech -oba →Every word from Czech žaloba →