Where does “thak” come from?

thak (Middle English) comes from Old English þæc, from Proto-West Germanic þak, from Proto-Germanic þaką, from Proto-Indo-European (s)teg- — to cover; pole, stick, beam.

Ancestry of “thak”, step by step

StepLanguageWordMeaning
1Old Englishþæcroof; thatch
2Proto-West Germanicþakroof, cover
3Proto-Germanicþakąroof, cover
4Proto-Indo-European(s)teg-to cover; pole, stick, beam
Every word from Proto-Indo-European (s)teg- →Every word from Proto-Germanic þaką →Every word from Proto-West Germanic þak →