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English word thank comes from Proto-Indo-European *tong-, and later Proto-Germanic *þankōną (To thank.)
*tong- (Proto-Indo-European)
*þankaz (Proto-Germanic)
Gratitude; thanks. Remembrance. Thought; mind; consideration.
*þankōną (Proto-Germanic)
To thank.
þancian (Old English)
To thank.
thankien (Middle English)
thank (English)
(transitive) To credit or hold responsible.. (transitive) To express gratitude or appreciation toward.. (transitive) To feel gratitude or appreciation toward.