Where does “prodloužit” come from?
prodloužit (Czech) comes from Czech dlouhý, from Old Czech dlúhý, from Proto-Slavic dь̀lgъ, from Proto-Balto-Slavic dílˀgas, from Proto-Indo-European dl̥h₁gʰós — long.
prodloužit (Czech): to prolong; to lengthen
Ancestry of “prodloužit”, step by step