Where does “thonk” come from?

thonk (Old Frisian) comes from English think, from Middle English thinken, from Old English þyncan, from Proto-Germanic þunkijaną — to seem, to appear.

Ancestry of “thonk”, step by step

StepLanguageWordMeaning
1EnglishthinkTo ponder, to go over in one's head; To...
2Middle EnglishthinkenTo think, ponder; to deduce, figure out; to...
3Old Englishþyncanto seem
4Proto-Germanicþunkijanąto seem, to appear

Words derived from “thonk”

Every word from Proto-Germanic þunkijaną →Every word from Old English þyncan →Every word from Middle English thinken →