svariti

1. (of food) to digest
   Stomak mi nije svario tu tešku večeru. — My stomach didn't digest that heavy dinner.
2. colloq. (of news, an idea) to take in; to process; to digest
   Treba mi vremena da svarim ovu vest. — I need time to take in this news.
3. colloq. (with negation, of a person) to stand; to stomach
   Ne mogu da svarim njenog novog dečka. — I can't stand her new boyfriend.

The imperfective is variti in the sense 'to digest'.