bistriti

1. colloq. ironic (a topic, politics) to discuss; to chew over
   Svako jutro uz kafu bistrimo politiku. — Every morning over coffee we chew over politics.
   Ceo dan su bistrili tu utakmicu. — They were discussing that match all day.
2. (of a liquid) to clarify; to make clear
   Vinari bistre vino pre flaširanja. — Winemakers clarify the wine before bottling.
3. (of the mind, thoughts) to clear
   Šetnja mi uvek bistri glavu. — A walk always clears my head.

Bistriti politiku (or some other topic) is usually ironic: it suggests lengthy, often unproductive and self-important armchair discussion. In the sense 'to clarify, make clear', the perfective is razbistriti (razbistriti glavu 'to refresh one's head, get one's thoughts in order').