Where does “поустити” come from?

поустити (Old Church Slavonic) comes from Old Church Slavonic поустъ, from Proto-Slavic pȗstъ — desolate; empty.

поустити (Old Church Slavonic): to allow; to release; to send away

Definitions

  1. to allow; to release; to send away

Ancestry of “поустити”, step by step

поустити traces back through two separate lines of ancestry.

via Old Church Slavonic поустъ

StepLanguageWordMeaning
1Old Church Slavonicпоустъempty, desert, desolate
2Proto-Slavicpȗstъdesolate; empty

via Proto-Slavic pustìti

StepLanguageWordMeaning
1Proto-Slavicpustìtito let go
Every word from Proto-Slavic pȗstъ →Every word from Old Church Slavonic поустъ →