Where does “обостряться” come from?

обостряться (Russian) comes from Russian обостря́ть, from Russian обостри́ть, from Russian остри́ть, from Russian о́стрый, from Proto-Slavic ostrъ, from Proto-Balto-Slavic aśras, from Proto-Indo-European *h₂eḱrós, from Proto-Indo-European h₂eḱ- — sharp.

обостряться (Russian): to become sharp; to become more sensitive/acute;...

Definitions

  1. to become sharp; to become more sensitive/acute;...

Ancestry of “обостряться”, step by step

StepLanguageWordMeaning
1Russianобостря́тьto escalate, to intensify
2Russianобостри́тьto escalate, to intensify
3Russianостри́тьto sharpen, to whet
4Russianо́стрыйpointed, sharp; sharp, pointed
5Proto-Slavicostrъsharp
6Proto-Balto-Slavicaśrassharp
7Proto-Indo-European*h₂eḱróssharp
8Proto-Indo-Europeanh₂eḱ-sharp
Every word from Proto-Indo-European h₂eḱ-Every word from Proto-Indo-European *h₂eḱrósEvery word from Proto-Balto-Slavic aśras