thank

Origin

From Middle English thank (“gratitude; expression of gratitude, thanks; attractiveness; commendation, praise; God’s grace; goodwill; merit, reward; mind, thought”), from Old English þanc, þonc (“gratitude; expression of gratitude, thanks; favour, grace; mind, thought; pleasure, satisfaction”), from Proto-Germanic *þankaz (“gratitude; expression of gratitude, thanks; mind, thought; remembrance”), ultimately from Proto-Indo-European *teng- (“to perceive; to think”). Cognates Cognate with Saterland Frisian Tonk (“thanks”), West Frisian tanke (“thanks”), Cimbrian dånke (“thanks”), Dutch dank (“thanks”), German Dank (“thanks”), Vilamovian dank, daŋk, daonk (“thanks”), Yiddish דאַנק (dank, “thanks”), Danish tak (“thanks”), Elfdalian tokk (“thanks”), Faroese takk, tøkk (“thanks”), Icelandic takk, þökk (“thanks”), Norwegian Bokmål and Norwegian Nynorsk takk (“thanks”), Swedish tack (“thanks”), Gothic 𐌸𐌰𐌲𐌺𐍃 (þagks, “thanks”), Vandalic *þank- (“thanks”); also Latin tongeō (“to know”). For the think - thank relation, compare typologically Russian призна́тельный (priznátelʹnyj) (< знать (znatʹ).