Uncertain, but possibly young child's pronunciation of thanks or an acronym for 'thanks a lot'.
Alternatively, derived from Danish tak, from Old Norse þǫkk, from Proto-Germanic *þankō, *þankaz.
Altered from si in the 19th century to prevent having two notes of the musical scale starting with the same letter, to become ti. vowel changed to 'a' to signify a flattened note.
Modern English dictionary
Explore and search massive catalog of over 900,000 word meanings.
Word of the Day
Get a curated memorable word every day.
Challenge yourself
Level up your vocabulary by setting personal goals.