Where does “Tvrdík” come from?

Tvrdík (Czech) comes from Czech tvrdý, from Proto-Slavic tvьrdъ, from Proto-Balto-Slavic *twírˀtas, from Proto-Indo-European twerH- — to enclose, fence in; to grab, seize; to stir.

Ancestry of “Tvrdík”, step by step

StepLanguageWordMeaning
1Czechtvrdýhard; difficult, hard
2Proto-Slavictvьrdъhard, firm, solid
3Proto-Balto-Slavic*twírˀtashard, firm, solid
4Proto-Indo-EuropeantwerH-to enclose, fence in; to grab, seize; to stir
Every word from Proto-Indo-European twerH- →Every word from Proto-Balto-Slavic *twírˀtas →Every word from Proto-Slavic tvьrdъ →