tart

From Middle English tart, from Old English teart (“sharp, rough, severe”), from Proto-West Germanic *tart, from Proto-Germanic *tartaz (“rough, sharp, tearing”), from Proto-Germanic *teraną (“to tear”), from Proto-Indo-European *der- (“to flay, split, cleave”). Related to Scots tairt (“tart; tartness”), Dutch tarten (“to defy, challenge, mock”), German trotzen (“to defy, brave, mock”), perhaps Albanian thartë (“sour, acid, sharp”).

From Middle English tart, tarte, from Old French tarte, tartre (“flat pastry”) (compare Medieval Latin tarta), of unknown origin. Perhaps an alteration of Old French torte, tourte, from Latin turta, perhaps from tŏrta f (“twisted”), in which case it would be cognate to torta.

From a rebracketing of sweetheart, or from jam tart (“attractive woman”) by shortening.