Where does “potěžkati” come from?

potěžkati (Old Church Slavonic) comes from Czech těžký, from Proto-Slavic tęžьkъ, from Lithuanian tingus, from Proto-Indo-European tengʰ-, from Proto-Indo-European ten- — to stretch, to extend.

Ancestry of “potěžkati”, step by step

StepLanguageWordMeaning
1Czechtěžkýheavy; hard
2Proto-Slavictęžьkъheavy
3Lithuaniantinguslazy
4Proto-Indo-Europeantengʰ-to pull; to be heavy, difficult
5Proto-Indo-Europeanten-to stretch, to extend
Every word from Proto-Indo-European ten- →Every word from Proto-Indo-European tengʰ- →Every word from Lithuanian tingus →